Imidyl- and isoimidyl-phthalic anhydrides, process for their manufacture and their use for curing epoxide resins
CA 1051435 A · Owner: Ciba-Geigy Ag · Inventors: Darms, Roland; Kvita, Vratislav; Greber, Gerd
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to new imidyl compounds of the formula Ia and isoimidyl compounds of the formula Ib (Ia) , (Ib), in which A denotes a defined divalent organic radical especially, an ethenylene, ethylene or propylene group. These compounds serve as curing agents for epoxide resins and give cured products with good mechanical and electrical properties.
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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
- Granted March 27, 1979. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 27, 1996.
- 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
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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.