Tip sealing configuration for a fan
CA 2381029 C · Owner: Pratt & Whitney Canada Inc. · Inventors: Raw, John A.; Liu, Xiaoliu
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Preferably a turbofan engine includes a fan blade (22) rotatably mounted , within a generally cylindrical casing (18) for rotation about a lengthwise extending central axis. An annular lining (24 26) is mounted within the , casing between a tip of the fan blade (22) and the casing (18). The lining (24, 26) seals the tip of the fan blade (22) within the casing (18). The lining (24, 26) includes a brush seal (34) that extends around an inner circumference of the casing (18), and has a plurality of bristles (38) that extend radially inward from the seal (34). A retaining membrane (36) extends around the brush seal (34), preventing the bristles (38) from extending substantially in a …
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 September 25, 2000 and granted July 26, 2011. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 25, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 25, 2022.
- 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.