Selective valve to pass fluids
CA 2003438 C · Owner: Petroleo Brasileiro S.A. - Petrobras · Inventors: Pellegrini-Ribeiro, Marcos
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention is of a selective valve to pass fluids and consists of a body, and a housing, and is provided above and in the middle with a communicating passage for low surface tension and viscosity fluid, there being shells inside seated upon the, aforesaid housing, said shells consisting of a surface of a shape and a size that is controlled, a soft surface and, orifices, a sealing surface created in the contact area of the aforesaid shells where it meets the aforesaid housing and there, being, below and in the middle a communicating passage in touch, with the fluid compressed by the pump. Preferred versions of the aforesaid selective valve are also covered provided with, controlling …
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 November 21, 1989 and granted July 30, 1996. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 21, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 21, 2011.
- 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.