Flexible low bulk pre-impregnated tow
CA 2218907 C · Owner: Applied Fiber Systems, Ltd. · Inventors: Davies, Robert M.; Ramasamy, Alagirusamy
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method for producing flexible, low-bulk towpreg which involves powder coating a bundle of unspread fiber tows (35) arranged in a predetermined crosssectional shape, and the resulting towpreg. During the powder coating process the resin powder particles do not enter into the fiber bundle but rather only , coat the surface fibers comprising the tows resulting in dry fibers in the , core of the towpreg and outer fibers which are coated with a discontinuous sheath of resin on the surface of the towpreg surrounding the core of dry fibers. The resin layer on the surface of the towpreg is formed by a partial melting of the powder particles. A post-treatment process can be used to convert …
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 March 11, 1996 and granted September 11, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 11, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 11, 2018.
- 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.