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:
Dec. 11, 1990
Filed:
Oct. 06, 1989
Applicant:
Inventor:
Alexander M Purcell, Guilford, CT (US);
Assignee:
Summagraphics Corporation, , US;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G01V / ; G09G / ;
U.S. Cl.
CPC ...
250221 ; 340707 ;
Abstract
A coordinate position determining system and method includes a liquid crystal material separating first and second groups of conductors. The tablet is at least partially light transmissive, but may include a partially reflective layer. The first and second groups or conductors are sequentially scanned at different times. A wand adapted to be positioned against the tablet includes a light detector, and may also include a light source.
Quick Actions:
Purcell, Alexander. (1990). Liquid crystal position determining system and wand device (U.S. Patent No. 4977315). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/4977315
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile