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:
Apr. 03, 1990
Filed:
Apr. 08, 1987
Applicant:
Inventors:
Katsuya Takanashi, Hadano, JP;
Kimitoshi Yamada, Hadano, JP;
Assignee:
Hitachi, Ltd., Tokyo, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G09G / ;
U.S. Cl.
CPC ...
364521 ; 340721 ; 340798 ; 382 45 ;
Abstract
In a transfer data screen buffer added to a multi-window display, a command stream for displaying segments to be displayed and superposed over the multi-window display is stored. By the execution of the command stream, the display data developed into a bit map undergoes exclusive OR operation bit by bit with the bit-map developed data of the multi-window data. The operation result is fed back to the display screen bit map memory to be displayed.