Touch-tone encoder unit for mobile radio transmitter
Patent 4101871 Issued on July 18, 1978. Estimated Expiration Date: 
December 20, 1996. 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.
December 20, 1996. 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 3538256 Dialing apparatus for a portable radio telephone Touch-to-rotary converter for a telephone instrument Automatic pushbutton dial assembly for a subscriber telephone Patent #: 4012601 InventorApplicationNo. 05/752203 filed on 12/20/1976US Classes:341/29, With variable pulse spacing or grouping341/27, With audible or tactile indicator379/368, Plural-switch number input device (e.g., keypad)455/128, With casing or housing455/95Mobile or portableExaminersPrimary: Pitts, Harold I.Attorney, Agent or FirmInternational ClassesH04M 19/04 (20060101)H04M 19/00 (20060101) AbstractA touch-tone encoder unit is provided for a mobile radio transmitter which is constructed as a single unitary package comprising a keyboard, a first printed circuit board positioned adjacent to the rear face of the keyboard which includes a switching circuit for providing connections from the individual pushbuttons of the keyboard to a row of connector pins on the first printed circuit board, a second printed circuit board containing the encoder circuit positioned adjacent to the first printed circuit board and electrically connected thereto by way of the connector pins which are received in connector holes in the second printed circuit board, and a housing attached to the keyboard and serving to sandwich the printed circuit boards between it and the keyboard in a unitary assembled condition.Other References
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