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
Host route convergence based on sequence values
Method and system for generating and displaying an interactive dynamic graph view of multiply connected objects
Systems and methods for arranging and labeling cardiac episodes
Resource capacity monitoring and reporting
LED package chip classification system
Ink, ink jet recording method, ink cartridge, and ink jet recording apparatus
Systems and methods for managing fleet services
  Randomly Featured Patents
Process for preparing biaxially stretched polyester films
Steel spring damper
Method and apparatus for lavaging with oxygenated irrigating fluid while suctioning
Segmented scleral band for treatment of presbyopia and other eye disorders
Composite bearing material and method of making the same
Lens driving device
Method of forming a semiconductor thin film
Loading and identifying a digital rights management operating system
Method and apparatus for stock and index option price improvement, participation, and internalization
Gas sensor having metal-oxide semiconductor layer