Expired Canadian patentCanada
Resin treatment of hexitol esters
CA 1281740 C · Owner: National Distillers And Chemical Company · Inventors: Sublett, Michael D.; Blewett, Charles W.
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The thermal stability of hexitol esters can be improved by removing metal cations and phosphate and other anions from the esters by means of ion exchange materials.
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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 19, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 19, 2008.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledJuly 17, 1986
GrantedMarch 19, 1991
Term endedMarch 19, 2008
Patent numberCA 1281740 C
Classification (IPC)C07C67/56 +2 more
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.