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:
Jan. 28, 1986
Filed:
May. 23, 1984
Applicant:
Inventors:
Francis P Carrasco, Danbury, CT (US);
Gerard A DeRome, New Milford, CT (US);
David W Fernekes, Danbury, CT (US);
Assignee:
Burroughs Corp., Detroit, MI (US);
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
H04M / ;
U.S. Cl.
CPC ...
179 / ; 179 / ;
Abstract
Disclosed is an energy detection circuit for use in a facsimile system autodialer/controller. The circuit monitors a telephone line and nulls out transmit tones leaving only receive signals. The analog receive signals are processed to produce a digital signal indicating the on-off times of receive energy on the telephone line. The energy on-off times may then be evaluated by a microprocessor included in the facsimile system autodialer/controller to determine whether a dial tone, busy signal or ring back is being received.