Nondestructive testing of multilayers ceramic capacitors
CA 1237772 A · Owner: N.V.Philips'Gloeilampenfabrieken · Inventors: Boser, Otmar H.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
PHA. 21.226 6, ABSTRACT:, A method for nondestructive testing of multilayer ceramic capacitors made from piezoelectric materials to determine the presence or absence of delaminations. The capacitor is inserted in an impedance bridge, a bias voltage of 1. to 2.5 times the rated voltage is applied and the impedance is measured as a function of frequency. A lower than expected impedance indicates a defective capacitor.
Read the whole patent
Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Granted June 7, 1988. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 7, 2005.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.