Rotating machine seal device
CA 2287509 C · Owner: Umemura, Sunao · Inventors: Ono, Masaki; Umemura, Sunao; Kubota, Jun
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Rotating machine seal device is improved so that seal plate is fitted to rotating portion firmly thereby self-induced, vibration of the seal plate is reduced and occurrence of abrasion or thinning of the seal plate due to the self-induced vibration and sealing deterioration accompanying therewith are prevented. In rotating machine seal device having seal plate (2) inserted into groove (1a) provided in disc: portion (1) driven rotationally, said seal device being for sealing fluid between fluid passage (12) on outer circumferential side of said groove (1a) and fluid passage (14) on inner circumferential side of said groove (1a) said seal plate (2) is, divided into plural pieces along …
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 February 22, 1999 and granted November 11, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 22, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 22, 2021.
- 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.