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:
Aug. 06, 1991
Filed:
Jun. 23, 1989
Applicant:
Inventor:
Howard Sinberg, Coral Springs, FL (US);
Assignee:
Aptek Technologies, Inc., Deerfield Beach, FL (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H04M / ;
U.S. Cl.
CPC ...
379398 ; 379345 ; 379402 ; 330259 ;
Abstract
By the use of a feedback arrangement, deleterious circuit effects of an isolation transformer in a terminal device for a telephone line can be eliminated. By this arrangement, a smaller, cheaper transformer may be used. A terminal device employing such arrangement can present a balanced termination to a telephone line, exhibit a known and controlled impedance to that line and provide for signals to be coupled to and from that line.