Hybrid telephony communication system
Patent 4775996 Issued on October 4, 1988. Estimated Expiration Date: 
September 30, 2007. 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.
September 30, 2007. 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 3513443 Infrared telephone extension control system Cordless telephone system Digital space phone system Method and apparatus for interference free communications between a remote handset and a host subscriber unit in a Cellular Radio Telephone System Wireless hands-free conference telephone system Patent #: 4669108 InventorsAssigneeApplicationNo. 07/102944 filed on 09/30/1987US Classes:379/56.3, Including infra-red link with landline telephone network455/462Including private cordless extension systemExaminersPrimary: Lev, RobertAttorney, Agent or FirmInternational ClassesH04M 1/72 (20060101)H04M 1/737 (20060101) AbstractA wireless telephony system comprising a base station and at least one portable device. The base station employs a ratio frequency (RF) receiver and an optical transmitter. The portable device employs an optical receiver and an RF transmitter. | |
