Spark-producing mechanism for wheel assembly
CA 2005789 C · Owner: Yeh, Cheng-Siung · Inventors: Yeh, Cheng-Siung
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
TITLE OF THE INVENTION:, SPARK-PRODUCING MECHANISM FOR WHEEL ASSEMBLY ABSTRACT OF THE DISCLOSURE, A spark-producing mechanism for wheel assembly comprises a plurality of flints, a fixing ring for the mounting of flints which closely fits to the shaft of the wheel, a grindstone which is inserted in the interior of the wheel. By rotating the wheel the, flints rub against the grindstone to produce sparks.
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 December 18, 1989 and granted October 26, 1993. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 18, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 18, 2011.
- 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.