Self-lubricating sealing ring
CA 2176800 C · Owner: Paleczny, Anthony R. · Inventors: Paleczny, Anthony R.; Sutherland, Ian Bruce
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A sealing ring for fitting between and sealing an annular space between a spigot end of a length of pipe and a bell-shaped end of another length of pipe which are slid into each other to form a pipe joint. The sealing ring comprises an annular main body having a first surface for engaging the spigot end and a second surface for engaging the bell-shaped end during the formation of the pipe joint. A thin rupturable membrane of a thickness less than 0.008 inches is attached to the second surface about the circumference of the annular main body defining an annular cavity. A lubricant is disposed in the annular cavity, either between the second surface and the rupturable membrane or in an …
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 May 16, 1996 and granted February 1, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 16, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 16, 2018.
- 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.