Rotary damper
CA 2033023 C · Owner: Oosawa, Takafusa · Inventors: Oosawa, Takafusa
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A rotary damper has a hollow cylinder having upper and lower flanges to serve as a pivot. One arm is tightly fitted on one of the upper and lower flanges and extends essentially in tangential direction of the associated flange. The other arm is pivotal with rotation of the outer pivot and extends essentially in tangential direction of outer pivot. A coil spring is wound around the outer periphery of the hollow cylinder. The ends of the coil spring are connected to the arms for exerting spring force in a direction opposite the pivoting direction of the arms.
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 December 21, 1990 and granted August 30, 1994. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 21, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 21, 2012.
- 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.