Polytetrafluoroethylene and elastomer seal
CA 2249916 A1 · Owner: Johnston, David E. · Inventors: Johnston, David E.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A bi-material shaft seal for sealing a shaft. The shaft seal includes a rigid case and a hinge, member connected to the case. The shaft seal further includes a resilient sealing element bonded to, the hinge member. The seal element has a first notch. The first notch extends through the seal, element to the hinge member.
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 October 9, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 9, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 9, 2020.
- 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.