Low noise fan assembly
CA 2076100 C · Owner: Gliebe, Philip Roger · Inventors: Gliebe, Philip Roger; Ho, Patrick Yu-Sing
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A gas turbine engine rotor assembly such as a fan or compressor includes a plurality, of rotor blades spaced axially from a plurality of stator vanes inside an annular duct. The, number of vanes is selected for a predetermined number of blades for obtaining substantially, equal values of a cut-off ratio for at least two blade passing frequency harmonics for reducing, spinning mode noise from the duct.
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 December 18, 2001. 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.