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:
Mar. 14, 1989
Filed:
Oct. 02, 1987
Applicant:
Inventors:
John L Stewart, Eugene, OR (US);
Bradley C Stewart, Eugene, OR (US);
Assignee:
Other;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H03M / ;
U.S. Cl.
CPC ...
341154 ; 341144 ; 455 31 ;
Abstract
A digital-to-analog (D/A) converter for connecting to a computer's parallel port, while allowing another peripheral to be attached to, and use, the same port. The D/A converter requires no external power supply. The D/A converter may be used to produce speech, music or other sounds.