Friction seal ring
CA 1324167 C · Owner: Hermanson, Dean E. · Inventors: Hermanson, Dean E.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention provides for a friction seal device for use in an annular space formed between cylindrical members such as a pump means and a casing means of an oil or gas well where the first of these cylindrical members has a surface against which the device is sealingly engaged and where the second of the cylindrical members has a surface for friction and sealing engagement with the device. The friction seal device comprises a first leg for sealingly engaging the surface of the first cylindrical member, and a second leg which is flexibly attached to the first leg in order to allow the legs to move relative to one another and the engagement surfaces of the cylindrical members particularly …
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
- Granted November 9, 1993. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 9, 2010.
- 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.