Canadian application, no grantCanada
Propeller
CA 2122161 A1 · Owner: Lawrence, Albert Benjamin Rutter · Inventors: Lawrence, Albert Benjamin Rutter
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, one or more blades of which has the configuration of a sinusoidal curve wrapped around its shaft in a semi-circle and whose leading edge is at the nadir of the sine curve and whose trailing edge is at the zenith.
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 April 26, 1994. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended April 26, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 26, 2016.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledApril 26, 1994
GrantedNo grant recorded
Term endedApril 26, 2014
Patent numberCA 2122161 A1
Classification (IPC)B63H1/28
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.