Helicopter
CA 2135392 C · Owner: Sakura, Kiyoshi · Inventors: Toda, Nobuo; Sakura, Kiyoshi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A cabin 1 of a helicopter is separated structurally from an airframe 2, and the cabin is supported on the airframe 2 by using both springs 6 and actuators 7. The high frequency vibration, which is the mast uncomfortable high frequency component of the number of revolutions of rotor, is absorbed by soft springs, and the resonance of the spring and the rotor rotation is actively inhibited by actuators, so that the vibrations of wide frequency is removed from the cabin, thereby achieving comfortableness to ride in the helicopter.
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 March 16, 1994 and granted December 7, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 16, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 16, 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.
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.