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:
Jun. 14, 1994
Filed:
Feb. 28, 1991
Applicant:
Inventor:
Scott K Bader, Mesa, AZ (US);
Assignee:
Motorola, Inc., Schaumburg, IL (US);
Primary Examiner:
Int. Cl.
CPC ...
H04M / ; H03G / ;
U.S. Cl.
CPC ...
379390 ; 330284 ; 330288 ;
Abstract
A speakerphone with a varying gain current mirror circuit is provided. The varying gain current mirror circuit is within the DC control loop of the speakerphone such that by varying the gain of the current mirror circuit, the attenuation range of the speakerphone is correspondingly varied.