Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Subset switching means in apparatus for a key telephone system for enabling intercom substations to access trunk lines










Image Number 2 for United States Patent #4081615.

In an attachment apparatus for a key telephone system of the type which permits a plurality of intercom substations to access a trunk telephone line via a common communication circuit, a novel subset operable switching circuit is disclosed that permits each subset access to said common communication circuit only on an individual one-at-a-time basis. Transistor circuitry is provided to lock out other stations when more than one subset tries to gain access at the same time.








 
 
  Recently Added Patents
Method and device for reliable estimation of network traffic
Low drop-out regulator providing constant current and maximum voltage limit
Image forming apparatus
System for seeking for an optimal configuration of a bi-, tri- or multi-ventricular cardiac resynchronization implanted device
Wireless communications system, wireless communications apparatus, wireless communications method and computer program for wireless communication
Interface circuit
Electronic component mounting machine and operating instruction method for the same
  Randomly Featured Patents
Methods and apparatus for collecting and transferring information over a network
Modified chlorinated polypropylene, process for producing the same and use thereof
Faceplate for wall-mount distributed filter housing
Logic and memory device integration
Liquid crystal projector equipment
Method and apparatus for mixing fibers
Organic cell
Acceleration detector for a tire of a motor vehicle
Rotatable guide member for a socket for electrical parts
Reflective optical element and EUV lithography appliance