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:
Sep. 22, 1992
Filed:
Apr. 10, 1990
Applicant:
Inventor:
Albert V Crewe, Palos Park, IL (US);
Assignee:
Orchid One Corporation, Palos Hills, IL (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01J / ;
U.S. Cl.
CPC ...
313-7 ; 313552 ; 313558 ;
Abstract
An electron beam system comprises a vacuum enclosure, a source of electrons within the enclosure, and a passive pump located within or in communication with the enclosure for pumping gases from the enclosure. A supplemental active pump is coupled to the vacuum enclosure and functions simultaneously with the passive pump for pumping from the enclosure gases not removed, or not removed efficiently, therefrom by the passive pump.