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:
Sep. 19, 1978
Filed:
Apr. 11, 1977
Applicant:
Inventor:
Richard W Williams, Englewood, CO (US);
Assignee:
Other;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H04M / ;
U.S. Cl.
CPC ...
179 / ;
Abstract
A two-way telephone amplifier uses a microphone-speaker switching system with the microphone normally on. Incoming or off-line voice signal causes switching to open the transmit line and close the receive line. Features of the invention include a bridge circuit with transmit and receive lines all connected to one side of the secondary of a telephone line coupling transformer.