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:
Jul. 09, 1985
Filed:
Dec. 29, 1982
Emanuel J Fulcomer, Jr, Little Silver, NJ (US);
AT&T Bell Laboratories, Murray Hill, NJ (US);
Abstract
When using membrane key pads, it is often desirable to provide the user with a sense that contact has been made. In this regard, there is disclosed a 1 KHz 4-bit counter which is normally held at a count just beyond the place where 'ones' appear in the third bit position. When it is desired to provide an audio click, the processor resets the counter to zero and then releases the counter. The 'ones' in the third bit position, which occur in four consecutive counts, control the application of the 1 KHz frequency to the mechanical sounder. By connecting the fourth bit position to the synchronous reset input, the counter stops incrementing after the four consecutive 'ones' and waits for the next reset by the processor.