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:
Jan. 03, 1995
Filed:
May. 03, 1993
Applicant:
Inventors:
Glade B Bacon, Everett, WA (US);
Heber P Farnsworth, Snohomish, WA (US);
Assignee:
Fluke Corporation, Everett, WA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01C / ;
U.S. Cl.
CPC ...
338 20 ; 338 21 ; 338 / ; 338 / ; 338 48 ; 338295 ; 338320 ; 361 56 ; 361106 ;
Abstract
A thermistor device includes plural thermistor elements in series, one or more of which is shunted with a varistor so that if such thermistor heats up and drops excessive voltage, the current therethrough is diverted to the varistor until other thermistors in series also heat to a high resistance state. The thermistor and varistor elements are thermally joined so that the various thermistor elements are rapidly brought up to temperature and prevent prolonged voltage drop across a protective varistor.