Aircraft
CA 2236094 C · Owner: Schier, Johannes · Inventors: Schier, Johannes
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A torque-balanced aircraft comprises (coaxiallyarranged) an annular wing, a central propeller a drive, motor for driving the central propeller a useful-load, container and servo-drive means arranged between the drive motor and the useful load container for displacing the useful-load container relative to the drive motor. The annular wing serves as a torque-balancing means. At least one of the drive motor and the annular wing is rotatable in a direction opposite to a rotational direction of the propeller, and both the drive motor and the annular wing are rotatable relative to the useful-load container.
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 23, 1996 and granted August 20, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 23, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 23, 2018.
- 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.