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
Horse stationary tab
Systems and methods for image stream processing
Method and system for detecting center pivot collision
Method for fabricating a nitrided silicon-oxide gate dielectric
Method, base station and system for adjusting cell wireless configuration parameter
Method and system for monitoring service quality in a mobile node
Image processing apparatus and method having defective pixel detection and correction ability
  Randomly Featured Patents
Medical injector with button activation
Row decoder for nonvolatile memory having a low-voltage power supply
Curved hand light
Needle re-capper
Support bracket for a filter or the like
Image processing method, carrier medium carrying image processing program, image processing apparatus, and imaging apparatus
Method and apparatus for predicting motion vector using global motion vector, encoder, decoder, and decoding method
Write back buffer with error correcting capabilities
Highly dilutable polishing concentrates and slurries
Zoom lens and photographing system