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:
Feb. 28, 1989
Filed:
Oct. 22, 1987
Applicant:
Inventor:
Donald E Drumm, Billerica, MA (US);
Assignee:
Wang Laboratories, Inc., Lowell, MA (US);
Attorneys:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G09G / ;
U.S. Cl.
CPC ...
340707 ; 434325 ; 434335 ; 353 42 ;
Abstract
A cursor positioning device for a computer system having a projection display monitor including a screen. A light pointer in the form of an elongated housing is positioned with its tip at a selected location on the screen. A light sensor detects the raster scan trace and transmits a timed electrical signal to an interface, which determines the coordinates of the selected location for use by a computer in controlling the position of the cursor on the projection screen.