Trans-cyclohexane-1,4-diisocyanate which is completely or partially blocked with epsilon- caprolactam; and the manufacture and use of the same
CA 1270822 C · Owner: Huls Aktiengesellschaft · Inventors: Wolf, Elmar; Gras, Rainer
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to trans-cyclohexane-1,4-diisocyanate which is completely or partially blocked with epsiloncaprolactam and a method of manufacturing the same wherein 1 mole trans-cyclohexane-1,4-diisocyanate is reacted with 1 to 2 moles epsilon-caprolactam, without or with the presence of solvents. These blocked diisocyanates are used for polyurethane powders.
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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 June 26, 1990. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 26, 2007.
- 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.