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:
Mar. 28, 1978
Filed:
Mar. 07, 1977
Applicant:
Inventors:
Robert L Davis, Prospect, CT (US);
Stephen L Domyan, Norwalk, CT (US);
Assignee:
Summagraphics Corporation, Fairfield, CT (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G08C / ;
U.S. Cl.
CPC ...
178 19 ;
Abstract
A position coordinate determination device wherein data generation lines are displaced from the edges of a data surface, and a sensing device is movably located on the surface. Erroneous detection of data resulting from reflection of signals at the edge of the sheet is inhibited by summing the times required for waves to pass between the sensor and both data generation lines. When this sum exceeds a predetermined level, an erroneous detection is indicated and the processing of the data may be inhibited.