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
Pet urn enclosure
Prodrugs of [4 [4-(5-Aminomethyl-2-fluoro-phenyl)-piperidin-1-yl]-(1H-pyrrolo-pyridin-yl- )-methanones and synthesis thereof
Storing a location within metadata of visual media
Server providing pseudo print preview and final regular preview to device
Adding co-users to user definable co-user lists
Spreading technique applied to broadband mobile communications by satelite relying on DVB-RCS
Methods, systems and computer program products for importing data from an edge router to a network management system
  Randomly Featured Patents
Laser scanning interferometric surface metrology
Electronic game converter
Neuronal gene transfer of adenovirus and herpes virus vectors
Railway wheel
Work vehicle
U.V. Curable composition
Vehicle power supply system
Vehicle sensor monitoring system
Frequency divider with variable capacitance
Webcam with foldable case and lens cover