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:
Mar. 18, 1997
Filed:
Nov. 20, 1995
Applicant:
Inventor:
Wolfram Maass, Erlensee, DE;
Assignee:
Leybold Aktiengesellschaft, Hanau, DE;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C23C / ;
U.S. Cl.
CPC ...
20429808 ; 20429803 ; 20429806 ; 20429814 ; 20429826 ;
Abstract
An AC voltage source connected to at least one cathode is switched off rapidly upon the occurrence of a critical number of so-called 'microarcs' which precede a 'large arc'. In order to be able to differentiate between large arcs and microarcs, a special counting and evaluation device is provided.