Expired Canadian patentCanada
Propeller blade subassembly and method for making a propeller blade subassembly
CA 2028970 C · Owner: Fecto, Marcia A. · Inventors: Fecto, Marcia A.
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A propeller blade spar/foam subassembly is manufactured by disposing a lamination of prepreg within a mold, closing the mold about a spar and injecting foam into mold cavities formed at the lead edge and the trailing edge of the spar. - 9 -
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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 31, 1990 and granted July 26, 1994. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 31, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 31, 2012.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledOctober 31, 1990
GrantedJuly 26, 1994
Term endedOctober 31, 2010
Patent numberCA 2028970 C
Classification (IPC)B29D99/00 +2 more
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.