Small-sized direct-current motor
CA 2045496 A1 · Owner: Tajima, Kazuo · Inventors: Tajima, Kazuo
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A small-sized direct-current motor in which a PTC thermistor made of a BaTiO3 ceramic material with the ratio V.beta./? 25 of the withstanding voltage V.beta. to the ordinary-temperature resistivity ?25 in a range of from 7 to 20 is connected to an armature coil in series and is disposed within a motor housing.
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 8, 1990. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 8, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 8, 2012.
- 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.