Electronic switch activated by current flow through the human body
Patent 4069659 Issued on January 24, 1978. Estimated Expiration Date: 
January 24, 1995. 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.
January 24, 1995. 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 3244369 3482241 3803834 3812384 Switching device equipped with a semiconductor memory element Reducing power consumption in calculators Impedance responsive touch actuated circuit Electronic calculator watch structures Touch responsive keyboard apparatus Multi-function watch casing Patent #: 3975899 InventorsApplicationNo. 05/650310 filed on 01/19/1976US Classes:708/111, Horological device235/145R, KEYBOARDS307/116, Condition responsive341/22, Including keyboard or keypad368/159, Crystal368/87, Integrated circuit708/143, Nonmechanical key actuation968/899, Touch switches particularly adapted to timepieces (in general H03K 17/96) [G04G 1/00K]968/937, Combined with a calculator or computing means [G04G 9/00F2]968/939By building up characters using a combination of indicating elements and by selecting desired characters out of a number of characters or by selecting indicating elements the positions of which represent the time (this subclass is a combination of subclasses 942 and 954) [G04G 9/00H]ExaminersPrimary: Jackmon, Edith S.Attorney, Agent or FirmAbstractAn electronic circuit having two states, at least one of which is stable and which permits information to pass from one terminal to the other. The circuit can be activated by the flow of a minute electric current through the human body. The circuit is particularly suitable for any hand-held instrument such, for example, as an electronic calculator watch of the digital type and including electronic logic. It permits to activate certain functions or to carry out certain calculations by activating a conductive surface by means of a hand-held metallic pin or the like. This makes it possible to provide a large number of functions or operations and to display numbers say on the face of a watch and to activate each one by touching it with a pin held by the wearer of the watch or instrument. | |
