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. 25, 1987
Filed:
Jan. 15, 1985
Applicant:
Inventor:
Samuel F Wood, Los Altos Hills, CA (US);
Assignee:
D.A.V.I.D. Systems, Inc., Sunnyvale, CA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04M / ; H04M / ;
U.S. Cl.
CPC ...
379382 ; 379240 ;
Abstract
An interface system having a single detector to detect incoming signalling including ringing, tip ground, forward loop current, and reverse loop current. Relays and bias control are utilized to perform outgoing signalling and for configuring the system to defect the various incoming signalling states with a single detector.