Nondestructive inspection method of polymer insulator and apparatus for performing the same
CA 2201229 C · Owner: Ngk Insulators, Ltd. · Inventors: Nakamura, Itushi; Hori, Masahiro; Okawa, Yasushi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The disclosed nondestructive inspection method of inspecting a securing defect of a polymer insulator having an FRP (Fiber Reinforced Plastic) core an outer cover portion arranged around the FRP core and at least one metal member secured to at least one end of the FRP core includes the steps of; measuring an acoustic emission signal generated when the metal member is secured to the FRP core by using compression dies; and determining whether or not the securing defect is generated on the basis of the acoustic emission signal in process. Moreover the disclosed apparatus performs the nondestructive inspection method mentioned above.
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
- Filed March 27, 1997 and granted October 31, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 27, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 27, 2019.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
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.