Tightening screw
CA 2092018 C · Owner: Nakamura, Daijiro · Inventors: Nakamura, Daijiro
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The tightening screw of the invention comprises a screw member forming female threads or male threads in the shaft core part, a flange ring fitted to the outer periphery of the screw member to contact with the object to be tightened an, operating ring for feeding a rotational force by fitting oppositely to the flange ring on the outer periphery of the screw member, and a torque transmitting member interspaced between the screw member and operating ring for transmitting the rotational force of the operating ring to the screw member, wherein, the torque transmitting member comprises a reduction mechanism for transmitting the rotational force of the operating ring to the screw member by …
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 19, 1993 and granted November 24, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 19, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 19, 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.