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:
Aug. 18, 1992
Filed:
Sep. 28, 1990
Applicant:
Inventor:
Kenneth J Freeman, Eagan, MN (US);
Assignee:
Rosemount Inc., Eden Prairie, MN (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H05B / ;
U.S. Cl.
CPC ...
219497 ; 219492 ; 219494 ; 219506 ; 340581 ;
Abstract
An ice detector circuit controls heating of a probe detecting ice. The circuit generates an icing output as a function of a temperature output generated by the probe. A control circuit cyclically controls a start time of the heating. A time measurement circuit measures a warm-up time to a first temperature threshold below the melting temperature, and measuring a melting time to a second temperature above the melting temperature. A comparator compares the melting time to a stored comparison parameter adjusted by the warm-up time and provides the icing output.