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Ifay F. Chang Patents
Chang; Ifay F.
Somers, NY
No. of patents:

Patent Number Title Of Patent Date Issued
8138886 Communication enabled active lock system March 20, 2012
An active lock system includes wireless communication capability and information display and processing functions providing convenience, security and privacy protect usable as a secured lock and/or as a lock box for storing a key or code, permitting access to a locked premise. The lo
7643435 Method and system for establishing a voice communication solution for business transactions and January 5, 2010
A method and a system for establishing a self-owned and self-managed network-based voice communication solution (VCS) for supporting business transactions and commerce applications over the communications network(s) including the Internet and PSTN. The voice communication solution is
7325029 Methods for enabling e-commerce voice communication January 29, 2008
Methods for operating multimedia computers to provide e-commerce voice communication capability directly between any computer connected to a computer network such as the Internet and any telephone device connected to the PSTN are disclosed. A simple click and call method is enabled by
7065070 Method and system for establishing a voice communication service for business transactions and c June 20, 2006
A method and a system for establishing a self-owned and self-managed network-based voice communication solution (VCS) for supporting business transactions and commerce applications over the communications network(s) including the Internet and PSTN. The voice communication solution is
5764223 Touch-screen input device using the monitor as a light source operating at an intermediate frequ June 9, 1998
A CRT touch screen having raster-generated light patterns at the viewing screen borders of a conventional CRT. Reflective surfaces proximal to the screen borders reflect the light patterns across the CRT surface to external photodetectors. Modulating the horizontal blanking signal or
4792728 Cathodoluminescent garnet lamp December 20, 1988
A cathodoluminescent lamp in the form of a vacuum diode or triode uses a self-supporting YAG crystal as the light emitter. The crystal shape can be selected (spherical, slab, bar) for desired effect and light trapping is turned to advantage by selectively coating the crystal surface to p
4767192 Light activated light valve with a silicon control element August 30, 1988
In contrast to existing light addressed light valves for projection displays which use a homogeneous CdS or Se photoconductive layer as the control element for a liquid crystal cell, a silicon photo-diode array is disclosed which makes an effective control element capable of applying a
4642459 Light pen input system having two-threshold light sensing February 10, 1987
A fiber optic light pen has been adapted for high resolution use with an interactive display of a computer system. The body of the light pen, which is adapted to be hand held, includes a slightly movable tip for engaging a display screen. When so engaged, a screen sensor within the body
4500955 Full word coding for information processing February 19, 1985
Words input to an information processing system character-by-character are given unique unitary representations independent of alphanumeric content and order. A user selects a particular vocabulary set containing the unique unitary representations of each word in the vocabulary set. When
4491762 Flat storage CRT and projection display January 1, 1985
A flat storage cathode ray tube with enhanced brightness is described. A mesh collector and a dielectric storage site array form an integral part of a silicon wafer. The silicon wafer includes thereon an addressable array of field effect transistors having a field effect transistor a
4440831 Zinc silicate phosphor particles and method for making them April 3, 1984
Improved zinc silicate phosphor particles are made by using silicic acid particles in the range from 0.7 to 10 micrometers coated with Mn.sub.2 O.sub.3 .multidot.xH.sub.2 O and then a layer of ZnO particles about an order of magnitude smaller which are fired to form the phosphors. The
4231892 Manganese doped zinc silicate luminescent phosphors with III-V oxide substitutions November 4, 1980
A series of solid solutions in the systems Zn.sub.2 SiO.sub.4 -Zn.sub.2 M.sup.+3.sub..5 M.sup.+5.sub..5 O.sub.4, is synthesized by practice of this disclosure. Solid reaction technique is used where M.sup.+3 and M.sup.+5 signify ions from Groups III and V of the periodic table.Large incr
4149108 Multistable cathode ray type storage display device April 10, 1979
A multistable or memory electron beam addressed electroluminescent display panel is provided. The display panel is electron beam activated in the presence of an A. C. field, without the need of prior art flood guns. The panel may be activated or switched by direct electron beam activatio

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