Process for manufacturing fiber-reinforced base materials for the electrical industry
CA 2019258 A1 · Owner: Witco Gmbh · Inventors: Mrotzek, Werner; Burba, Christian
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to a process for manufacturing fiber-reinforced boards for the electrical industry by the use of epoxy resins and latent curing agents based on imidazole/acrylic acid reaction products based on the general formula, (I), wherein R, R1 and R2 are independently of one another, H or a, short-chain alkyl group having from 1 to 3 carbon atoms R3 is, a group of the formula, -O- (CH2)m - R4 (II) wherein m is an integer between 2 and 6 R4 is H, -OH or -O-, and n is equal to the valence of R3. JK7:2485-SPC
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 June 19, 1990. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended June 19, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 19, 2012.
- 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.