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. 20, 1991
Filed:
Oct. 01, 1990
Applicant:
Inventor:
Frank A Raso, Spencerport, NY (US);
Assignee:
General Signal Corporation, , NY (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H03K / ; H03H / ;
U.S. Cl.
CPC ...
307520 ; 307521 ; 328167 ; 333172 ; 333174 ;
Abstract
A failsafe bandpass filter/decoder system comprising: an active bandpass filter which comprises a high-pass filter section having selected resistors which can only decrease in value during a failure mode and, in series with the high-pass filter section, a low-pass filter section having selected resistors which can only increase in value during a failure mode, whereby under any failure mode, the pass band of the filter will be reduced; and a level detector having an upper threshold voltage trip point and a lower threshold voltage trip point, both trip points having to be exceeded by the input wave form to produce a proper (square wave) output.