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:
Nov. 05, 2002
Filed:
Apr. 19, 2001
Applicant:
Inventors:
Robert E. Ellefson, Manlius, NY (US);
Louis C. Frees, Manlius, NY (US);
Assignee:
Inficon Inc., East Syracuse, NY (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G01L 2/130 ; H01J 4/900 ;
U.S. Cl.
CPC ...
G01L 2/130 ; H01J 4/900 ;
Abstract
In an ionization gauge, the effect of X-rays emitted when a collimated electron beam strikes grid surfaces in the gauge structure is reduced by a louvered beam stop. The louvered beam stop creates shadow regions having no X-rays, thus minimizing the amount of X-rays striking the collector plate and reducing the X-ray effect portion of the residual current.