Expired Canadian patentCanada
Conical rod piston
CA 2058308 C · Owner: Thomas Industries Inc. · Inventors: Rozek, Roy J.
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A one-piece piston assembly including a frustoconical piston is secured to a crankshaft ring via a joint or waist member. Preferably the joint or waist member is frusto-conically shaped as well. Additionally the piston and joint member preferably are hollow.
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 23, 1991 and granted April 16, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 23, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 23, 2013.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledDecember 23, 1991
GrantedApril 16, 2002
Term endedDecember 23, 2011
Patent numberCA 2058308 C
Classification (IPC)F16J7/00 +2 more
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.