Dual chamber pumping apparatus
CA 2003402 A1 · Owner: Di Palma, Giorgio · Inventors: Di Palma, Giorgio; Bartholomew, Victor L.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A dual chamber pumping apparatus and method for infusing fluids to a patient includes a disk having a fluid inlet and a fluid outlet. Resilient membranes are attached to opposite sides of the disk to establish dual pumping chambers and a, network of one-way valves connects the fluid inlet in alternating fluid communication with the pumping chambers. A one-way outlet valve connects the pumping chambers alternately in fluid communication with the fluid outlet. The one-way valves utilize a hollow, elastomeric tube fixedly disposed in passageways within the disk for covering and uncovering respective ports in response to fluid pressure differentials on the inner and outer surfaces of the walls …
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 20, 1989. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 20, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 20, 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.