Method of making a pre-impregnated composite material
CA 2089310 A1 · Owner: Bouffard, Louis · Inventors: Bouffard, Louis; Belanger, Germain; Gilbert, Yves
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The disclosure describes a method of making a pre-impregnated composite material of asbestos fibre weaving that comprises the steps of passing a bidirectionally woven asbestos fabric in a resin bath formed between a pair of impregnating rollers to form an impregnated sheet. Both faces of the latter is covered with a film of plastic material to form a laminated sheet which is then wound onto a roller. This laminated roll is left to mature and is then refrigerated prior to being used for subsequent moulding.
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 February 11, 1993. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended February 11, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 11, 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.