A device for helicopter logging
CA 2221205 A1 · Owner: Chentsov, Vitaly Georgievich · Inventors: Chentsov, Vitaly Georgievich
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The device for hauling felled trees by helicopter comprises a cable attached to the helicopter hull and a grab attached to the lower part of the cable. The distance between the cable-hull attachment points and the grab lies in the range 1.78 - 7.27 times the diameter of the helicopter rotor. The pincer-type grab is provided with a hydraulic or electrical drive and at least two air fans arranged on the grab symmetrically in relation to the cable attachment point.
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 February 3, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended February 3, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 3, 2019.
- 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.