Reinforced elastomer lining for pump casing and associated method of manufacture
CA 2094451 C · Owner: Envirotech Pumpsystems, Inc. · Inventors: Hood, Claude R. Jr.; Ostler, Jay L.; Turley, Roger S.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A replaceable lining for a centrifugal pump casing includes a continuous substantially rigid shell made of thermoset plastic resin material reinforced with woven roving fiberglass fabric sheets and randomly dispersed glass fibers. The lining also includes an elastomer layer bonded to an inner surface of the rigid shell. Both the elastomer layer and the shell have a volute section and a semicylindrical or semiconical discharge section integral therewith. The discharge section of the shell is provided along an outer surface with a plurality of outwardly projecting arcuate reinforcement ribs spaced along the discharge section. The ribs are integral with the shell. The shell is preformed and …
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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 20, 1993 and granted November 24, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 20, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 20, 2015.
- 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.