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. 14, 1993
Filed:
Sep. 25, 1992
Applicant:
Inventors:
William Dawson, Sunnyvale, CA (US);
Dean Drako, Cupertino, CA (US);
Assignee:
Apple Computer, Inc., Cupertino, CA (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G09G / ;
U.S. Cl.
CPC ...
345150 ; 345145 ; 345147 ;
Abstract
A circuit for generating pixel values for an overlay for a bitmapped output display including apparatus for testing the color value of a background pixel, apparatus for setting the color value of the pixel of the overlay to a minimum value for the particular color if the color value of a background pixel is greater than a preselected value, and apparatus for setting the color value of the pixel of the overlay to a maximum value for the particular color if the color value of a background pixel is less than the preselected value.