Piezoelectric and pyroelectric tubes
CA 1206277 A · Owner: British Telecommunications Public Limited Company · Inventors: Pantelis, Philippos
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Film with piezoelectric and pyroelectric properties is obtained by extruding PVDF stretching, the extrudate and applying a corona discharge preferably at the place where stretching occurs. The PVDF may be homopolymer but copolymers of at, least 50 mole % of vinylidene fluoride with tetrafluoroethylene and/or trifluoroethylene may be used.
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 17, 1986. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 17, 2003.
- 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.