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:
Nov. 20, 1979
Filed:
Apr. 12, 1978
Louis M Sandler, North Reading, MA (US);
P. R. Mallory & Co. Inc., Indianapolis, IN (US);
Abstract
In a touch control system including one or more touch sensitive devices which capacitively transmit a relatively large electrical signal when not touched and transmit a relatively small electrical signal when touched an improved means for detecting the touch and no-touch conditions of the touch sensitive devices includes a comparator having positive feedback associated therewith. By increasing or decreasing the positive feedback the touch control system is operable either asynchronously or synchronously with an external control system. Furthermore, a plurality of touch sensitive devices may be multiplexed utilizing a single detection means constructed in accordance with the invention disclosed herein while requiring a relatively low voltage drive signal.