Non-metallic spin-on filter
CA 2238652 C · Owner: Michels, Larry Dean · Inventors: Stockhowe, John W.; Michels, Larry Dean
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A plastic oil filter (10) comprises a cup-shaped shell (12) with an open end (14). The shell contains an annular filter media (36). A backplate (40) is positioned in the open end of the shell. An elongated core (38) is positioned in the opening in the filter media. The core is hollow and has a plurality of openings (62) in the walls thereof. Sealing washers (69, 70) are provided at each end of the filter media for preventing undesired flow between the core and the ID of the respective sealing washers.
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 4, 1997 and granted June 11, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 4, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 4, 2019.
- 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.