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. 14, 1981
Filed:
Sep. 14, 1979
Applicant:
Inventors:
Edward I Nelson, Sunrise, FL (US);
Harry B Mueller, Hollywood Hills, FL (US);
John E Lane, Pompano, FL (US);
Assignee:
Burroughs Corporation, Detroit, MI (US);
Primary Examiner:
Int. Cl.
CPC ...
G06F / ;
U.S. Cl.
CPC ...
3403 / ; 250229 ;
Abstract
The invention relates to a photo-optical keyboard having an improved keyboard housing and keys to provide an N-key rollover feature. The keyboard is comprised of a keyboard housing and keys, and may have a baseplate. The key has a pair of grooves oriented along the axis for both columns and rows to allow the passage of light regardless if the key is in the up position or the depressed position. The keyboard further contains a reset feature to synchronize keyboard logic if it becomes unsynchronized when partial key depressions are made.