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. 02, 2015
Filed:
May. 09, 2012
Ryan Lindsay, Brentwood, CA (US);
Roger White, Livermore, CA (US);
Scott Bowman, Fairfax, CA (US);
John Cochoy, Brentwood, CA (US);
Ryan Lindsay, Brentwood, CA (US);
Roger White, Livermore, CA (US);
Scott Bowman, Fairfax, CA (US);
John Cochoy, Brentwood, CA (US);
CURTIS INSTRUMENTS, INC., Livermore, CA (US);
Abstract
An isolation monitor is disclosed in which a switchable bias voltage is imposed on a chassis ground. An isolation voltage is measured when a bias voltage is applied. When there are no electrical faults, the isolation voltage swings up and down to known values. When a fault occurs, the isolation voltage will not to swing to the known values, and thus the isolation resistance can be measured and alarm generated if the isolation resistance falls below a threshold value.