Cordless telephone system
Patent 4456793 Issued on June 26, 1984. Estimated Expiration Date: 
June 9, 2002. 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.
June 9, 2002. 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 ReferencesInfrared personnel locator system Electronic key telephone system with bi-directional serial data stream station control Fiber optic signal conditioning circuit Telephone subscriber station Telephone subscriber station Patent #: 4317234 InventorsAssigneeApplicationNo. 06/386722 filed on 06/09/1982US Classes:379/56.3, Including infra-red link with landline telephone network379/165, Switching or supervision feature (e.g., common control, digital)379/92.01, Polling379/93.14, Having switching station398/100, Subscriber system398/103, Through free space398/121, Satellite system455/417, Call diversion455/438Serving site initiatedExaminersPrimary: Schreyer, Stafford D.Attorney, Agent or FirmInternational ClassesH04B 10/10 (20060101)H04Q 7/26 (20060101) H04M 1/72 (20060101) H04M 1/737 (20060101) AbstractThe present key telephone system comprises cordless telephone stations (FIGS. 6 and 7) which communicate over a line-of-sight transmission end link (276 or 277). The system further comprises a central controller (101) for switching communications between the cordless stations and to the message network. The central controller does not provide any station to transmission channel concentration. Concentration occurs in the bidding by a cordless station for access to a channel provided by the line-of-sight transmission end link. A particular number of transmission channels are provided by the line-of-sight end link which are bid for by any practical number of cordless stations. Subsystem controllers (104) are provided in a large cordless key telephone system. The subsystem controller reformats data for transmission between the central controller (101) and a cordless station. A unique code identifies a cordless station so that the allocation of a new channel to a cordless station may occur automatically when a cordless station is detected within the boundaries of a new subsystem.Other References
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