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. 07, 1992
Filed:
Apr. 11, 1990
Applicant:
Inventor:
Daniel G Bills, Boulder, CO (US);
Assignee:
Granville-Phillips Company, Boulder, CO (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G01L / ; H05H / ;
U.S. Cl.
CPC ...
324459 ; 324462 ; 3133631 ;
Abstract
An ionization gauge and controller therefor where the gauge has a sensitivity which is reproducible gauge to gauge and stable over time in the same gauge. An ionization gauge with a very much lower and a somewhat higher pressure limit than prior art gauges is also disclosed. Elements are also described for launching all electrons in a tight beam in Bayard-Alpert type geometry, so that all the conditions for reproducible and stable sensitivity are satisfied. Elements are also described for collecting all electrons at low energy so that soft X-ray production is negligible.