Four-way slide valve
CA 2031160 A1 · Owner: Automatic Switch Company · Inventors: Kramer, Gary; Holborow, Peter
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A four-way slide valve including an elongated valve body (10) having an inlet port (15), an outlet port (16) and two working, ports (17, 18). A slide assembly (28) within the body is movable longitudinally to alternatively interconnect the outlet port with one or the other of the working ports. The slide assembly carries two longitudinally spaced-apart first and second pistons (33,35) which define first and second chambers (38,39) between the pistons and their respective ends of the valve body. Passageways (41,49,50) within the slide assembly provide communication between the first chamber and the outlet port, and a control device such, as a pilot valve (59) within the valve body …
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 29, 1990. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 29, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 29, 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.