Hydraulic seal assembly
CA 2071548 C · Owner: Vernon, Richard J. · Inventors: Vernon, Richard J.; Janian, Robert; Lee, John
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An improved seal (1) used in a hydraulic system having a piston rod (7) in a housing (5). The seal has stressing and sealing members (15, 17) with the latter being in point contact (23) with a piston rod under low fluid pressure and an additional point contact (29) with the piston rod under high fluid pressure. A shallow concavity (27) between point contact (23) and the contact area entraps lubricating fluid when the seal is subjected to high fluid pressure. In another modification, the sealing member (17) has an incline (35) on the face in contact with stressing member (15). Thus, under high fluid pressure stressing, member (15) is forced up the incline (35) exerts increased pressure, …
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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 February 8, 1990 and granted April 16, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 8, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 8, 2012.
- 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.