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:
Mar. 20, 1979
Filed:
Apr. 10, 1978
Roy Stockdale, Huntington, NY (US);
Napco Security Systems, Inc., Copiague, NY (US);
Abstract
An automatic telephone dialer is described which includes a dial tone detection circuit. The dial tone detection circuit responds to a series of tones which are prerecorded on a magnetic tape. The dial tone detection circuit operates to detect the tones and to provide a signal suitable to activate a dialing relay for tone bursts on the tape of a suitable predetermined duration. Upon receipt of a suitable duration tone burst, the tone detection circuit provides an accurate duration signal to provide a relatively identical delay at the beginning and end of a dialing pulse to thereby maintain an accurate dial mark/space ratio determined by the requirements of the telephone line which is accessed by the dialer.