Gas turbine spindle bolt seal device
CA 2252274 C · Owner: Mitsubishi Heavy Industries, Ltd. · Inventors: Nakamura, Takeshi; Sakata, Kaoru
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In gas turbine constructed such that steam is used for cooling of gas turbine high temperature portion to be then recovered steam is prevented from leaking in spindle bolt portion of turbine disc. Seal hole 4 is formed in turbine disc 8 portion through which spindle bolt 1 passes. In the seal hole 4 seal piece 3 having smaller coefficient of linear expansion than the spindle bolt 1 and seal piece cover 5 for covering the seal piece 3 are disposed. The seal piece cover 5 is bored with pressure hole 6 through which high pressure side steam pressure is introduced into inner side of the seal piece cover 5 so that the seal piece 3 of inner side is urged on sheet surface 7 of the seal hole 4.
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 30, 1998 and granted January 8, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 30, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 30, 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.