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. 31, 2007
Filed:
Jun. 07, 2005
Applicants:
Michael D. Borenstein, Boulder, CO (US);
Paul C. Arnold, Boulder, CO (US);
Inventors:
Michael D. Borenstein, Boulder, CO (US);
Paul C. Arnold, Boulder, CO (US);
Assignee:
Brooks Automation, Inc., Chelmsford, MA (US);
Primary Examiner:
Int. Cl.
CPC ...
G01L 9/02 (2006.01);
U.S. Cl.
CPC ...
Abstract
In a resistively heated heat-loss pressure gauge, electrical current is switched between a sensing element and a compensating element at different duty cycles. As a result, the sensing element is heated relative to the compensating element. A fixed resistance is placed in series with at least the compensating element. The current source applies current to heat the sensing element to a temperature at which the resistance of the sensing element matches the combined resistance of the compensating element and the fixed resistive element.