Pump apparatus for biomedical use
CA 2016595 C · Owner: Humberstone, Victor Carey · Inventors: Warby, Richard John; Ross, Calvin John; Humberstone, Victor Carey
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The pump apparatus (1) comprises a pump body (2) defining a pump chamber (6) and inlet and outlet ducts (15,20) communicating with the pump chamber a, piezoelectric membrane (10) operable to vary the volume of the pump chamber by movement of a flexible wall (9) of the pump chamber and first and second non return valves (13,18) located in the inlet and outlet ducts respectively. Each valve comprises a valve member (22,25) movable into and out of engagement with a cooperating valve seat (21,24) in response to pressure or suction generated in the pump chamber by movement of the wall. Magnets (30,36) are operable to bias the valve members into a seated position. The body including the valves is …
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 11, 1990 and granted August 25, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 11, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 11, 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.