Sliding piston for syringe
CA 2236703 C · Owner: Daikyo Seiko, Ltd. · Inventors: Sudo, Morihiro
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A sliding piston for a syringe, which is inserted in a hollow barrel of a syringe is made of a substantially cylindrical body having a shape symmetrically rotatable with respect to the axis of the hollow barrel. The cylindrical body has its largest diameter at the front end thereof. The peripheral edge of the front end of the cylindrical body is rounded at a radius of curvature of 5/100 mm to 10/100 mm. The diameter of the rear end of the cylindrical body is smaller than the inner diameter of the hollow barrel so as not to contact with the inner surface of the hollow barrel when the piston is inserted in the hollow barrel.
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 5, 1998 and granted January 29, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 5, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 5, 2020.
- 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.