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:
Jun. 04, 2002
Filed:
Nov. 13, 2000
Applicant:
Inventors:
Dinesh Agrawal, University Park, PA (US);
Ramesh Raghavendra, Dundalk, IE;
Balasubramaniam Vaidhyanathan, Leicestershire, GB;
Assignee:
Other;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H05B 6/64 ;
U.S. Cl.
CPC ...
H05B 6/64 ;
Abstract
Varistors are produced by pressing ceramic ZnO powder to provide discs, sintering the discs with microwave radiation, and firing outer electrodes with microwave radiation. The sintering has a maximum plateau temperature of 1000° C. to 1300° C. and the duration for ramping to this temperature and maintenance at this temperature is 120 to 180 minutes. These parameters also apply for multi-layer varistors with inner electrodes. The outer electrodes are fired at a maximum plateau temperature of 550° C. to 820° C. for a total duration of 40 to 45 minutes.