Wafer check valves
CA 1233394 A · Owner: Goodwin (R.) International Ltd. · Inventors: Goodwin, Richard S.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A wafer check valve having an annular housing closing flaps effective to close a passage through the housing and spring urged to a passage closing position the, flaps being mounted on one or more hinge pins the or each, hinge pin extending at each end into a bore in an insert the inserts being received in respective slots in the body and including means retaining the inserts in the slots without movement.
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
- Granted March 1, 1988. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 1, 2005.
- 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.