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
Wristband
Adapter
Valved, microwell cell-culture device and method
Computer program and apparatus for evaluating signal propagation delays
Electronic device, display, image processing apparatus and electronic calculating apparatus
System and method for removing oxide from a sensor clip assembly
System for collecting computer application usage data of targeted application programs executed on a plurality of client devices
  Randomly Featured Patents
Industrial fabrics containing finned fibers designed to resist distortion
Papillomavirus pseudoviruses for detection and therapy of tumors
Integrated microturbine gearbox generator assembly
Systems, methods, and articles of manufacture for performing product availability check
Method and apparatus of utilizing stored job information in an electronic reprographic printing system
Printing data on a non-integer dot grid for improved saturation
Interfacing between a command line interface-based application program and a remote network device
Chair
Air gun
Vertebral prosthesis and spinal fixation system