Branched telephone system
June 4, 2008. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3435151 Automatic call transfer circuit for a plurality of telephones Key telephone privacy exclusion apparatus Cordless telephone Cordless telephone Line switching circuit for cordless telephone Microprocessor controlled interface for cellular system Wireless mobile telephone communication system Telephone privacy protector Mobile radio communications system Patent #: 4748685 InventorsAssigneeApplicationNo. 162878 filed on 03/02/1988US Classes:455/463, Multi-users379/184, Lockout379/185Portable or mobileExaminersPrimary: Dwyer, James L.Attorney, Agent or FirmInternational ClassH04Q 007/04Foreign Application Priority Data1987-03-05 JPAbstractA branched telephone system having a plurality of telephones which are connected to a single subscriber line or to single radio apparatus functions to establish a priority set condition in which the communicating function of particular one of the telephones is validated to prevent the other telephones from being used, and further includes the function of automatically cancelling such a priority set condition. | |
