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. 09, 1993
Filed:
Dec. 18, 1990
Applicant:
Inventors:
James L Pappas, Leominster, MA (US);
Larry D Seiler, Boylston, MA (US);
Robert C Rose, Hudson, MA (US);
Assignee:
Digital Equipment Corporation, Maynard, MA (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G09G / ;
U.S. Cl.
CPC ...
340709 ; 340721 ;
Abstract
A circuit for generating an N by M pixel sprite cursor having edge extension features which are clipped to only appear in preselected windows on a video display. The circuit provides edge extension by extending the pattern appearing in the pixels located along the four edges of the sprite cursor towards the corresponding boundaries of the display. The circuit clips the cursor to preselected windows by determining on a pixel-by pixel basis which window owns the pixel to be displayed and whether the window will permit a cursor to appear in it.