Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Method of and apparatus for selectively controlling a plurality of remotely located loads










Image Number 4 for United States Patent #3964023.

A master controller is connected via a pair of wires to a plurality of loads and is capable of generating pulses having either positive or negative polarity and a voltage level either above a first threshold or below a second threshold or above the second threshold. Some of the slave units connected via these two wires to the master controller are singly handicapped and have a single zener diode whose avalanche voltage corresponds to the first threshold so that the load is energized whenever this first threshold is exceeded. Other units have a second zener diode in series of the first diode and itself having an avalanche voltage equal to the second threshold so that only when this second threshold is exceeded is the load energized. In such a system it is possible to provide a memory circuit to short circuit this second zener diode if it is desired to remove the double handicap and partially emancipate the slave unit. This memory circuit may comprise a thyristor connected across the second zener diode so that if the voltage in the input lines to the slave unit drop to zero the emancipation command from the memory is eliminated. In addition some of the slave units are connected via full-wave rectification bridges to the two conductors so that regardless of the polarity of the pulses they are energized, whereas others of the units do not have such fall-wave rectification so that reversal of the signal polarity cuts these slave units out.








 
 
  Recently Added Patents
Shape memory polymers formed by self-crosslinking of copolymers
Perfume bottle
LED driving circuit, LED illumination appliance, LED illuminator, and LED illumination system
Downlink scheduling in fractional frequency reuse (FFR) systems
Traffic signal mapping and detection
Method, apparatus and computer program product for providing metadata entry
Method for production of a thermoelectric apparatus
  Randomly Featured Patents
Method of forming an insulated gate field effect transistor device having a shield electrode structure
Portable communication device that may permit one wireless network to communicate with another wireless networks and method therefor
Method of making gas discharge display panel and gas discharge display device
Compartmentalized gas insulated transmission line
Method of generating mask distortion data, exposure method and method of producing semiconductor device
Method, system, and computer program product for sharing information within a global computer network
Interconnecting strut for arranging between adjacent landing flaps of an aircraft
Method and apparatus for automatically preparing flexible, disposable packing containers
Bacillus thuringiensis isolate active against hymenopteran pests and gene(s) encoding hymenopteran-active toxins
Intermediates in the preparation of homocamptothecin analogs