Water soluble, modified polyurethane
CA 1238745 A · Owner: Nl Chemicals, Inc. · Inventors: Tetenbaum, Marvin T.; Crowley, Burlon C.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A water dispersible modified polyurethane which is the, reaction product of polyisocyanate polyether polyol, modifying, agent containing at least two active hydrogen moieties and capping agent. The modified polyurethane is preferably prepared by reacting the polyisocyanate, the polyether polyol and the modifying agent and then adding the capping agent. The modified polyurethane resists microbial attack, exhibits superior efficiency in thickening aqueous compositions and imparts improved leveling. -44-
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
- Granted June 28, 1988. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 28, 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.