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. 26, 1978
Filed:
Jul. 13, 1977
Applicant:
Inventor:
Richard W Williams, Englewood, CO (US);
Assignee:
Other;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04M / ;
U.S. Cl.
CPC ...
179 / ;
Abstract
A connection across telephone lines includes a resistor having a shunted capacitor circuit holding a normally closed relay open and permitting it to close on closing the telephone circuit, by lifting the handset, to activate a recorder. Replacing the handset opens the circuit shutting off the recorder. A current limiting resistance in the recorder switch circuit prevents damage to the relay while the capacitor provides high current for activating the the relay solenoid. A bridge circuit eliminates polarity of the magnetically biased relay.