Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Telephone intercommunication system providing common access to a communication line










Image Number 4 for United States Patent #3931479.

A private telephone intercommunication system including facilities for connecting the system to a telephone central office. Common supervisory means are provided to control access to a line from each station.








 
 
  Recently Added Patents
Method for producing vinyl acetate monomer
Method for radiation sterilization of medical devices
Buckle
Determination method for a reinitialization of a temporal sequence of fluoroscopic images of an examination region of an examination object
Wheel
Digital rights management for media streams
Method for treating rheumatoid arthritis by administering an anti-IL-6 antibody and methotrexate
  Randomly Featured Patents
Method and apparatus for determining bins to be updated for polygons, including lines
Data error detection and device controller failure detection in an input/output system
Lanthanoid aluminate film fabrication method
Non-human transgenic animals for the study of neurodegenerative syndromes
Ink supply apparatus for rapidly coupling and decoupling a remote ink source to a disposable ink jet pen
Shoe for rehabilitation purposes
Rocker arm and rocker arm assembly for engines
Print pulse controller for a termal printhead
Carcass cremator
Rose plant named `4900`