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. 30, 2003
Filed:
Apr. 20, 2001
Applicant:
Inventors:
Erkki Rajala, Vaasa, FI;
Ralf Strümpler, Gebenstorf, CH;
Joachim Glatz-Reichenbach, Baden, CH;
Timo Jokiniemi, Vaasa, FI;
Assignee:
ABB Research Ltd, Zurich, CH;
Primary Examiner:
Int. Cl.
CPC ...
H02H 5/04 ;
U.S. Cl.
CPC ...
H02H 5/04 ;
Abstract
The invention relates to an apparatus for limiting an electrical current by using a PTC resistor being monitored by a monitor circuit. According to the invention, the monitor circuit issues a signal only after detecting the status of the PTC resistor for a defined time period after a PTC resistance change.