Trenched brush seal
CA 2075778 C · Owner: Stec, Philip Francis · Inventors: Stec, Philip Francis
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An improved seal apparatus is disclosed in which the distal ends of compliant bristle elements of a conventional brush seal are disposed in a groove in adjacent structure further being characterized, by lack of contact between the bristles and structure during steady state operation of the apparatus in which the seal is installed. Sealing is afforded by the tortuosity of the leakage path. Degradation of the seal due to wear of the bristles is markedly reduced. Multiple seals in one or more constant dimension or stepped dimension grooves is also contemplated.
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 August 13, 1992 and granted October 14, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 13, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 13, 2014.
- 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.