Apparatus for wireless transmission of a teaching program in a classroom
Patent 4229829 Issued on October 21, 1980. Estimated Expiration Date: 
March 16, 1998. 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.
March 16, 1998. 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 2345472 3122847 3277358 3330955 3476455 3862379 Stereophonic recording and playback apparatus Portable video recording system employing camera and recording stations connected by wireless links Patent #: 4097893 InventorApplicationNo. 05/887114 filed on 03/16/1978US Classes:398/122, Including alignment320/124, SEQUENTIAL CHARGING OR DISCHARGING OF BATTERIES OR CELLS379/430, Body supported (e.g., headgear)398/118, OPTICAL COMMUNICATION OVER FREEE SPACE398/127, In an office environment398/131, Including alignment434/351Wireless signalsExaminersPrimary: Griffin, Robert L.Assistant: Orsino, Joseph A. Attorney, Agent or FirmInternational ClassesH04B 10/10 (20060101)G09B 5/14 (20060101) G09B 5/00 (20060101) AbstractApparatus for wireless transmission of a teaching program in a classroom comprises a transmitting unit comprising a casing which houses one or more tape recorders with operating elements, a microphone and a plurality of infrared transmitters. A removable cover which can be hung on the wall has additional infrared transmitters connected by a cable to the transmitting unit. Each student has a head set with an infrared receiver, earphones and a microphone. The transmitting unit is remotely controlled by a portable ultrasonic transmitter. When not in use, the headsets are placed in a cabinet where the batteries of the headset are charged by means of induction coils on the head sets being magnetically coupled with induction coils in the cabinet to which high frequency current is supplied. The students may also have cassette recorders which, when not in use, are placed in charging chambers where power is transmitted from primary windings in the chambers to secondary windings in the cassette recorders to charge the batteries of the recorders.Other References
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