Pressure transfer modules
CA 2255885 C · Owner: Vaughn Thermal Corporation · Inventors: Loeffler, Herbert H.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention comprises an improved pressure transfer module having in one , embodiment, two double-diaphragm pumps (35 37; 45, 47) each having its , diaphragms connected to one another by a respective drive shaft (38 48) for , reciprocating motion. Spool valve assemblies (97 98, 107, 108) are directly , mounted to the connecting shafts of each pump and arranged to maintain the operation of the two diaphragms of the pumps 90 degrees out of phase in that each such assembly constitutes pressurized water control valves for the other pump. The two pumps are mounted so that a complete pumping cycle comprises four pumping strokes, one every 90 degrees. To insure reversal of motion of the …
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 April 28, 1997 and granted December 10, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 28, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 28, 2019.
- 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.