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:
Dec. 22, 1981
Filed:
Apr. 04, 1980
Applicant:
Inventors:
Daniel G Bills, Boulder, CO (US);
Paul C Arnold, Boulder, CO (US);
Assignee:
Granville-Phillips Company, Boulder, CO (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H05B / ;
U.S. Cl.
CPC ...
31511191 ; 313-7 ; 324462 ;
Abstract
A hot filament ionization gauge is provided with a very small diameter and/or very short collector to limit interception of X-ray flux. Suitable gauge sensitivity is achieved by additionally collecting ions at the collector support, which is shielded from the X-ray flux by a shield. Collection of ions by the shield is avoided by maintaining the shield at grid potential.