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:
Jul. 22, 1986
Filed:
Sep. 07, 1982
Applicant:
Inventors:
Alfred G Brisson, Schaumburg, IL (US);
Christopher Nowacki, Arlington Heights, IL (US);
Assignee:
Trutek Research, Inc., Arlington Hts., IL (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G06G / ; H03B / ;
U.S. Cl.
CPC ...
307491 ; 328162 ;
Abstract
An inhalation transducer circuit is provided for use with a transducer having a variable electrical output. Early amplifier stages provide very high gain, and are subsequently a.c. coupled to stages of lesser gain leading to a microprocessor and an output. An electronic switch is connected to the a.c. coupling circuit, and when no breathing is being measured and there is no output to the amplification circuit this switch is periodically closed to connect a reference voltage to the a.c. coupling, and thus to compensate for any DC drift in the transducer and early amplification stages.