Shielding apparatus
CA 2097154 C · Owner: Akesaka, Toshio · Inventors: Akesaka, Toshio
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A shielding apparatus comprises a cylindrical shield body, a crankshaft supported by the shield body rotatably around the axis of the shield body a, plurality of rotors successively provided in the direction of the axis in a front region ahead of the shield body and a driving mechanism for rotating the crankshaft around the axis, wherein the rotors define the outer surface of an approximately conical or truncated conical shape in conjunction with each other and the adjoining rotors are made eccentric with respect to the axis of the shield body in the different directions from each other.
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 May 27, 1993 and granted September 23, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 27, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 27, 2015.
- 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.