Method for unclogging pumps in a pumping system, and a valving arrangement therefor
CA 2122950 A1 · Owner: Itt Flygt Ab · Inventors: Bjorkander, Goran; Stahl, Peter
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
of the Invention, Two or more pumps operating in parallel, and conducting effluent, via parallel conduits have a shunt, line interconnecting the conduits and, the shunt line is interposed by, pair of valves. Each valve permits flow therethrough in one direction, which is opposite the flow-permitting direction of the other, but are oper-, ative to permit flow therethrough in both directions. By opening one, valve to bi-directional flow and, operating a complementary one of the pumps, shunted effluent conducts, through the valves and down through the other pump or pumps to dislodge, objects which clog the inlet(s) thereof.
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, 1994. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended May 5, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 5, 2016.
- 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.