Diamond film coating for mating parts
CA 2114739 C · Owner: Simpson, Matthew A. · Inventors: Simpson, Matthew A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
At least one of the mating wear surfaces of a sliding mechanical seal is coated with diamond. The coating includes an underlayer of high resistance to wear and an overlayer with a reduced resistance to wear as compared to that of the underlayer. The reduced wear resistance of the overlayer prevents damage by the diamond to the opposing mating surface during the wear-in period of use.
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 February 2, 1994 and granted January 14, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 2, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 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.