Infra-red wireless keyboard system
Patent 5189543 Issued on February 23, 1993. Estimated Expiration Date: 
November 19, 2010. 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.
November 19, 2010. 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 ReferencesInfra-red data communications system for coupling a battery powered data entry device to a microcomputer Method and device for initializing data, and particularly seismic data, acquisition apparatus Learning-functionalized remote control receiver Tuner control apparatus having tune-by-label capability and using alphabetical label storage Patent #: 4914517 InventorsAssigneeApplicationNo. 615567 filed on 11/19/1990US Classes:398/106, REMOTE CONTROL398/130Transmitter and receiverExaminersPrimary: Coles, Sr., Edward L.Assistant: Negash, Kinfe-Michael Attorney, Agent or FirmInternational ClassH04B 010/00AbstractA communication system comprising a wireless keyboard for emitting infra-red signals, a receiving unit for converting the infra-red signals to an electrical signal, a tuning and amplifying circuit coupled to the receiving unit for tuning and amplifying the electrical signals, a carrier filtering circuit for removing the carrier component of the input signal, a single-shot circuit coupled to the carrier filtering circuit for converting its input signal to a known code wave form, and a microprocessor for receiving the code wave. The invention allows multiple users to operate their wireless keyboards without interference.Other References
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