Ethoxylated lignite composition and method of preparing
CA 1236118 A · Owner: Nl Industries, Inc. · Inventors: Pober, Kenneth W.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
15-, Abstract of the Disclosure, Novel ethoxylated lignites which exhibit excellent water solubility as well as solubility in organic liquids are obtained by ethoxylating lignite at elevated temperatures using various weight ratios of ethylene oxide to lignite the ethoxy-, lation being conducted using an alkali metal alkylate catalyst in a solvent which is generally inert under reaction conditions.
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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 May 3, 1988. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 3, 2005.
- 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.