Method of making multi-walled storage tanks and products
CA 2120159 C · Owner: Kauffman, Donn K. · Inventors: Kauffman, Donn K.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Improved multi-wall containers and pipes (20) for transporting fluids which have to be protected against leakage and mechanical forces, have an inner (10) and outer (14) wall separated by a continuous foam layer (12) integrated into the containers. Improved strength and resistance to axial inertial pressure is provided by the method of manufacture using chopped glass fibers continuous windings of glass fibers and suitable polyester resins and circumferential ribs (16) spaced at stress points and integrally incorporated into the containment walls (10 14). Vessels produced according to the methods of the invention have a moment of inertia strength of about 4.67 in 4 substantially eliminating …
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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 August 19, 1992 and granted September 22, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 19, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 19, 2014.
- 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.