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:
Apr. 04, 1978
Filed:
Jul. 09, 1976
Applicant:
Inventor:
Cordell V Castleman, Bloomington, MN (US);
Assignee:
Magnetic Controls Company, Minneapolis, MN (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04M / ;
U.S. Cl.
CPC ...
179 / ; 179 / ; 307261 ; 1791 / ;
Abstract
An adapter circuit for converting dialing generated tone bursts on a telephone line into DC pulses of a length equal to the tone burst length so that the percent break may be measured. The DC pulse is initiated when the tone burst reaches 50% of its full value and terminated when the tone burst decays to 50% of its full value.