| Patent Number |
Title Of Patent |
Date Issued |
| 4922314 |
Hot charge-carrier transistors |
May 1, 1990 |
| Current flow through the base region of a hot charge-carrier transistor is by hot majority charge-carriers (i.e. hot electrons for a hot electron transistor) which are collected at a base-collector barrier. This barrier may be formed by a semiconductor region which is doped with an impur |
| 4922157 |
Electrodeless low-pressure discharge lamp with thermally isolated magnetic core |
May 1, 1990 |
| The electrodeless low-pressure discharge lamp comprises a discharge vessel (1) having an inwardly extending protuberance (2) and an evacuated outer bulb (5) having a protuberance (6) projecting into the protuberance (2). A soft magnetic body (3) is arranged in the protuberance (6). It is |
| 4920761 |
Ice-cream maker |
May 1, 1990 |
| An ice-cream maker having a cylindrical container, into which a discoid cold cartridge is insertable, and an electric motor, through a gear unit, drives a shaft located in the container. The shaft includes a scraper and stirrer tool acting at least together with the cold cartridge. The c |
| 4920287 |
Output buffer having reduced electric field degradation |
April 24, 1990 |
| A digital circuit with a 5 V power supply voltage in which NMOS transistors constructed in sub-micron technology are protected against excessive field strengths by means of additional transistors in order to prevent so-called "hot carrier stress" for this purpose the additional transisto |
| 4918819 |
Electric shaving apparatus |
April 24, 1990 |
| An electric shaving apparatus comprises at least one drivable shaving member, a first housing section which accommodates the drive mechanism for the shaving member and a detachable second housing section which accommodates an electric power source, for example a rechargeable battery, |
| 4918402 |
Delay circuit having at least one all-pass network |
April 17, 1990 |
| A third-order all-pass network for a delay circuit is formed by four coupled transconductors (G.sub.10 to G.sub.13) which are each represented by two transistors whose bases constitute the inputs and whose collectors constitute the outputs of the transconductor. A first input of these |
| 4918379 |
Integrated monolithic circuit having a test bus |
April 17, 1990 |
| For the testing of an integrated monolithic circuit (IC) the integrated monolithic circuit with a test bus which extends along a functional part of the circuit which is partitioned into macro circuits and which is coupled to the macro circuits, each macro circuit comprising a test in |
| 4918337 |
Active RC filter having band-rejection and all-pass modes |
April 17, 1990 |
| An active filter circuit operable in a band-rejection mode and in an all-pass mode. A cascade combination of an RC filter and amplifier circuit receives an input signal. A pair of amplifiers respectively receive the input signal and the output of the RC filter and amplifier combination. |
| 4918331 |
Logic circuits with data resynchronization |
April 17, 1990 |
| In relatively large systems of (integrated) circuits, data signals can experience a delay which is in the order of magnitude of a clock-pulse period. The receiving circuit (i.e. receiving the data signal) then receives the data signal too late (the clock pulse has ceased) and can at |
| 4916663 |
Fast-access data storage circuit having a two-dimensional carrier gas |
April 10, 1990 |
| This fast-access data storage circuit is made of a semiconductor material with a two-dimensional carrier gas between two of its layers. The material is rendered superconducting by a suitable choice of the temperature and magnetic field conditions. The circuit is formed by a plurality of |
| 4914380 |
Signal receiving arrangement |
April 3, 1990 |
| A signal receiving arrangement comprising first and second groups (14, 16) of frequency down-converting stages (18 to 24 and 26 to 34), each stage including a mixer (40) and a local oscillator (42) for frequency down-converting a signal applied to the stages (18 to 24 and 26 to 34), |
| 4913715 |
Method of manufacturing an optical fiber having a protective coating |
April 3, 1990 |
| A method of and a device for manufacturing an optical fiber with a protective coating. A cooling device cools the fiber after drawing from a preform. The cooling device comprises a forced-cooled double-walled tube. In the space enclosed by the inner tube through which the fiber to be |
| 4911528 |
Anamorphotic optical system and combined anamorphotic/deanamorphotic arrangement |
March 27, 1990 |
| Anamorphotic optical system transmitting an image while deforming it in one direction and leaving it undeformed in a substantially perpendicular direction. It comprises a main fibre-optical image guide (210) cemented to an exit face (213, 213.sub.2) of at least one beveled supplementary |
| 4910895 |
Steam iron pump mechanism |
March 27, 1990 |
| A steam iron having a pump mechanism (14) comprising a piston (15), a piston chamber (16) in which the piston is capable of moving, inlet and outlet ports (17,19) for the piston chamber, a return spring (31) and a control member for moving the piston in the opposite direction so as to |
| 4910869 |
Electric shaving apparatus |
March 27, 1990 |
| The invention relates to a shaving apparatus comprising a housing which can be used as a grip and a shaving head comprising at least one shaving unit, the shaving unit being inclined relative to the housing, which shaving unit comprises a stationary shaving member with hair-entry apertur |
| 4910714 |
Semiconductor memory circuit having a fast read amplifier tristate bus driver |
March 20, 1990 |
| A C-MOS semiconductor memory circuit includes a read amplifier and a tristate bus driver. The read amplifier is a two stage amplifier. The bit lines in the memory are connected via P-MOS pull-up transistors to the supply voltage. The logic low level is 1 Volt below the supply voltage. In |
| 4910638 |
Ceramic multilayer capacitor |
March 20, 1990 |
| In a multilayer capacitor, which is made of alternate layers 1 of a dielectric oxidic ceramic material and an electrode material 2, and which is provided with metallic end contacts 4 which electrically conductively contact a prescribed part of the layers of electrode material via an |
| 4910433 |
Emitterless SDN electrode |
March 20, 1990 |
| The invention relates to a high-pressure sodium vapor discharge lamp having a ceramic discharge vessel. In addition to sodium and possibly mercury the discharge vessel also comprises a rare gas. In the discharge vessel an electrode of a refractory metal is accommodated. In the operating |
| 4908707 |
Video cassette recorder programming via teletext transmissions |
March 13, 1990 |
| A system for video recorder programming using existing television broadcast teletext transmissions. The programs required are chosen from schedules displayed on teletext pages, the necessary control information is loaded automatically into a video recorder, and program labels are transmi |
| 4907867 |
Varifocal optical system and associated electro-mechanical control |
March 13, 1990 |
| This varifocal optical system is electro-mechanically controlled to vary focal distance, temperature correction focussing and finite distance focussing. It is constituted by four single lenses (L1, L2, L3 and L4) two of which (L2, L3) are movable and are axially translated to vary the |
| 4907115 |
Super conducting thin-film magnetic head including a magnetoresistive element |
March 6, 1990 |
| Thin-film magnetic head including a magnetoresistive element (1) and a face (9) for magnetically coupling the element with a magnetic recording medium. A magnetic yoke constituted by three layers (3, 5, 7) of a magnetically permeable material has a gap (13) which is bridged by the ma |
| 4907049 |
Charge-coupled semiconductor device having an improved electrode structure |
March 6, 1990 |
| A charge-coupled semiconductor device has a plurality of silicon electrodes for storing and transporting information-carrying charge, which electrodes are located on an insulating layer and are mutually separated by grooves having a width of at most 1 .mu.m. According to the invention, t |
| 4905111 |
Damping material of an improved formulation for use on a magnetic head |
February 27, 1990 |
| A damping material (19) is provided on one of the two side faces (7, 8), of a magnetic head having two plate shaped ferrite core limbs (3, 4). The material consists of a synthetic resin filled with less than 30% by volume of filler having a density of more than 10.times.10.sup.3 kg/m.sup |
| 4904607 |
Method of manufacturing an integrated infrared detector |
February 27, 1990 |
| A method of forming an integrated circuit for the detection of infrared radiation comprising a semi-isolating substrate provided with a buried PIN photodiode, with a junction field effect transistor J-FET, whose gate is connected to the PIN photodiode, and with a resistor R connected to |
| 4904051 |
Optical fiber provided with a synthetic resin coating |
February 27, 1990 |
| An optical fiber provided with a synthetic resin coating, comprising a glass fibre, a first enveloping layer of a synthetic rubber having a modulus of elasticity from 0.1 to 10 MPa and a subsequent enveloping layer of a synthetic resin having a larger modulus of elasticity than the first |
| 4904035 |
Coupling device for guiding a light beam |
February 27, 1990 |
| The invention relates to a coupling device for guiding a light beam sent through an end portion of an optical waveguide to the light-sensitive surface of a photodiode of a measuring instrument, in particular, an optical power meter, comprising an absorbing aperture associated with the |
| 4903404 |
Shaving apparatus |
February 27, 1990 |
| The invention relates to a shaving apparatus comprising a housing, at least one shaving unit and a trimmer, which is movable relative to the housing between an operational position and an operating position by means of a push-button, a spring being arranged between the trimmer frame and |
| 4903284 |
Accordion-type charge-coupled devices |
February 20, 1990 |
| The invention relates to a charge-coupled device of the accordion type provided with a shift register for supplying accordion clock voltages on the one hand and with clock lines for supplying conventiional clock voltages on the other hand. The electrodes are alternatively coupled to |
| 4903273 |
Laser diode control method and circuit |
February 20, 1990 |
| The operation of laser diodes requires a preset operating point. Owing to the spread in the characteristic curves of laser diodes, a costly adjustment is required for accurately determining this operating point, more specifically after each exchange of a laser diode. By using a control |
| 4903116 |
Integrated semiconductor circuit having a multilayer wiring |
February 20, 1990 |
| In integrated semiconductor circuits having multilayer wiring, in which the circuit elements formed in the semiconductor body are interconnected by connection conductors which extend at at least two levels located one above the other and are mutually separated by insulating layers, undes |
| 4903109 |
Semiconductor devices having local oxide isolation |
February 20, 1990 |
| A semiconductor monolithic integrated circuit comprising circuit elements built into isolated epitaxial layer islands is described. The isolation is accomplished by part by a p-n junction between the epitaxial layer and its substrate, in part by an insulated zone of converted epitaxial m |
| 4903098 |
Charge-coupled device |
February 20, 1990 |
| The invention relates to a charge-coupled device with an adjustable charge transport route having at least two ccd segments, which can be connected in series with each other by means of a switchable connection. This connection includes an output diode for the first segment, an input diod |
| 4903088 |
Semiconductor laser with large bandgap connection layer |
February 20, 1990 |
| A semiconductor device for producing electro-magnetic radiation consisting of a radiation-emitting element (LED or laser) and an injection element, which can inject hot charge carriers into the active layer of the radiation-emitting element composed of layers of one conductivity type. |
| 4903038 |
Horn antenna arrangement |
February 20, 1990 |
| A horn antenna arrangement comprising an H-plane sectoral horn 19 in combination with a feeder waveguide 2 in which radio-frequency energy is launched and propagated in the fundamental rectangular waveguide TE(1,0) mode and provided with a mode-converting section 25 of suitably shaped |
| 4902909 |
Flip-flop arrangement for a divide-by-2 frequency divider comprising master-slave type memory el |
February 20, 1990 |
| A flip-flop (40) for a divide-by-2 frequency divider having a first stage (50) formed by two master-slave-type memory elements (10a, 10b) each having a two-input NOR gate (20a, 20b), and by a second stage (60) with 2 NOR gates (61, 62) connected as an RS flip-flop. The memory elements (1 |
| 4902876 |
Electrical cooking apparatus |
February 20, 1990 |
| The electrical cooking apparatus has a hot plate (10), under which an electrical cooking unit (1) is arranged, which is provided with openings (5) for receiving the ends of the glass envelope (20) of an electric filament (21). The hot plate (10) is light-scattering at least in a region |
| 4902104 |
Display cell with alkyl mercaptan alignment layer |
February 20, 1990 |
| A display cell having two parallel transparent substrate plates which are interconnected at their periphery and which are each provided with an electrode and an orientation layer, and comprising a liquid crystalline compound in the cell space between the plates, the orientation layer bei |
| 4901436 |
Shutter for a dry-shaving apparatus and method of manufacturing a shutter |
February 20, 1990 |
| In a shutter (3) for a dry-shaving apparatus, which shutter serves for optinally covering or exposing a shear foil of said apparatus and which comprises an elastic carrier (11) and spaced-apart slats (10), the inherently stiff slats, viewed in the longitudinal direction of the shutte |
| 4900121 |
Method for establishing a connection between two optical lines and a device for implementation o |
February 13, 1990 |
| The invention relates to a method for establishing a connection between two optical lines, in which a spare length of light conducting fibre is withdrawn from a storage container and, after completion of the connections, pushed back in again. To reduce the space required for storage |
| 4898449 |
Connector for the detachable connection of light conducting fibres |
February 6, 1990 |
| The connector comprises two coupling elements (1) in each of which end parts of light conducting fibres (9) are secured mutually in parallel beside each other in such a manner that the centers of their end faces (15) are situated on one line (17) in an end face (19) of the coupling e |
| 4897876 |
Method of and an arrangement for digital signal encryption |
January 30, 1990 |
| An improved arrangement for digital signal encrytion using a cipher algorithm in which a multi-bit key signal is used to produce a first keystream signal of coding bytes which are used in an exclusive-OR logical operation with data bytes of a received digital data signal to produce an |
| 4897745 |
Method of adjusting the gaps of two magnetic heads arranged on one head disc, and head disc carr |
January 30, 1990 |
| In accordance with a method of adjusting the gaps of two magnetic heads (11, 12) which are arranged on a head disc (4) adjacent. One end portion of a supporting plate (6) is provided with a slot to form two limbs (9, 10) which project from a basic portion (8) of the supporting plate and |
| 4896421 |
Shaving apparatus |
January 30, 1990 |
| A shaving apparatus is provided having a housing provided with a holder for at least one shaving unit, which shaving unit comprises an external shaving member with hair entry apertures and an internal shaving member which is rotatable relative to the external shaving member, which intern |
| 4895585 |
Method of manufacturing lens elements |
January 23, 1990 |
| A method of manufacturing lens elements, in which a glass preform heated to the softening temperature and an annular metal holder (3) enclosing the glass preform are arranged between the heated moulding dies (7,9) of a mould and are moulded in a pressing step into a lens element comprisi |
| 4894912 |
Shaving apparatus |
January 23, 1990 |
| A shaving apparatus having a housing with a holder for a flexible cutting plate and a cutting member which has rigid cutting elements and can be driven so as to be rotatable with respect to the cutting plate, the cutting elements comprising cutting sides at the radial ends. The cutting |
| 4894702 |
High efficiency, small geometry semiconductor devices |
January 16, 1990 |
| A semiconductor device comprising a first region, which is laterally bounded by a second region comprising a countersunk oxide layer and a highly doped polycrystalline silicon layer, which is disposed thereon and is covered by an oxide layer partly countersunk into it. The side edge of |
| 4894544 |
Arrays of infrared detector elements |
January 16, 1990 |
| Each element of an array of infrared detector elements comprises a capacitor formed by a body (11) of pyroelectric or ferroelectric material between a front electrode (14) and a back electrode (12). The elements have individual electrical connections (13) to their back electrode (12) |
| 4893909 |
Magneto-optical light switching element and method of manufacturing same |
January 16, 1990 |
| A magneto-optical light switching element comprising islands which are formed from an epitaxial layer on the basis of bismuth-substituted rare earth metal iron garnet, which layer is provided on a nonmagnetic, optically transparent garnet substrate, integrated heating resistors being |
| 4893162 |
Integrated semiconductor arrangement of the coupling type between a photodetector and a light wa |
January 9, 1990 |
| An integrated semiconductor arrangement of the coupling type between a photodetector D and a light wave guide G.sub.1, operating in a band of given wavelengths, containing on the surface of a semiconductor substrate S of a III-V compound one after the other a confining layer C.sub.0 of |
| 4891880 |
Dry-shaving apparatus comprising at least one slidable shutter |
January 9, 1990 |
| A dry-shaving apparatus is provided comprising a shaving-head frame (2), which can be placed on a basic apparatus (1), which carries a shear foil (7), and which is detachably secured to the basic apparatus by means of at least one resilient latch (12), and at least one slidable shutter ( |
