Keyless electronic calculating pen
Patent 4141073 Issued on February 20, 1979. Estimated Expiration Date: 
August 8, 1997. 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.
August 8, 1997. 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 3617708 Single-hand digital calculator Writing instrument with calculator Miniaturized calculator keyboard switch assembly having universally pivoted key actuators Multi-modal data input/output apparatus and method compatible with bio-engineering requirements Patent #: 4070649 InventorApplicationNo. 05/822311 filed on 08/08/1977US Classes:708/107, Writing instrument (e.g., pen)382/186, Unconstrained handwriting (e.g., cursive)382/189, With a display401/195, COMBINED708/141Including specific nonkeyboard-type information entryExaminersPrimary: Malzahn, David H.Attorney, Agent or FirmInternational ClassesB43K 29/093 (20060101)B43K 29/00 (20060101) G06K 9/22 (20060101) G06F 3/033 (20060101) G06F 15/02 (20060101) G06K 9/18 (20060101) G06K 9/24 (20060101) AbstractKeyless Electronic Calculating Pen comprises a portable combination of a pen and an electronic calculator. Signals generated by the pen tip through designated strokes of numerals and calculating symbols upon writing on any surface of any writing medium are input directly to the calculator to perform calculating and displaying functions. The written record can be kept for checking and future reference. | |
