Welan gum in cement compositions
CA 1322011 C · Owner: Merck & Co. Inc. · Inventors: Best, Glen H.; Lindroth, Thomas A.; Allen, Floyd L.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Cement compositions i.e. mortar, structured, concrete, pre-cast concrete and oilfield cement, comprising 0.01-0.9% (wt/wt) welan gum are described. The cement compositions exhibit improved workability suspension of aggregates, air entrainment sag, resistance, flow characteristics and resistance to water loss. These improvements are maintained at elevated temperature.
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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 September 7, 1993. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 7, 2010.
- 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.