Piezoelectric ceramics
CA 2134919 C · Owner: Mase, Hiroshi · Inventors: Ushida, Yoshihisa; Mase, Hiroshi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A piezoelectric ceramic is provided which comprises a perovskite-based solid solution represented by the formula: Pb1-aMa((Ni1-bZnb)1/3Nb2/3}xTiyZrzO3, wherein M represents Ba or Sr and x + y + z = 1 the perovskite-based solid solution having added, thereto, La2O3 or Nd2O3, as a metallic oxide of Group A and NiO, Fe2O3, SnO2 or Ta2O5 as a metallic oxide of Group B. The piezoelectric ceramic of the present invention exhibits large value of piezoelectric constant d and high Curie point, so that it is useful as a material of a piezoelectric actuator.
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 November 2, 1994 and granted November 25, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 2, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 2, 2016.
- 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.