The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 24, 1977
Filed:
Jun. 16, 1975
Clifford C Johnson, Wheeling, IL (US);
Vincent E Eitzen, Evanston, IL (US);
American Hospital Supply Corporation, Evanston, IL (US);
Abstract
An electronic system employs a calculator as an arithmetic unit and accumulator. A mode switch enables operation as a timer (decrementing from a preset value) or a stopclock (incrementing time). Initial or preset values of time are entered manually through a keyboard in either mode. Sequencing circuitry controls execution of the arithmetic functions of the calculator in proper order and function, depending on the selected mode. The sequencing circuitry also gates the output of an oscillator to provide time increment pulses. A display unit generates a visual display of the accumulated time in both modes. In the timer mode, sensing circuitry senses when a preset time has elapsed and generates an audible signal.