Cross-linking titanium and zirconium chelates and their use
CA 1281174 C · Owner: E.I. Du Pont De Nemours And Company · Inventors: Smeltz, Kenneth Cleon; Putzig, Donald Edward
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Title, CROSS-LINKING TITANIUM & ZIRCONIUM CHELATES & THEIR USE Abstract of the Disclosure, Water-soluble N,N-bis-(2-hydroxyethyl)glycine/metal chelates represented by the formula: wherein R is H or alkyl (1-12C); M is Ti or Zr; k is a number in the range between 0 and 1, p is a number in the range between 1 and 2, and k + p = 2 (in particular embodiments: k = 1 and p = 1; k = 0 and p = 2; and k = 0.5 and p = 1.5). The chelates can be used as crosslinking agents in hydraulic fracturing fluids and in gels that are used for selectively plugging permeable zones in subterranean formations or for plugging subterranean leaks.
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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 12, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 12, 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.
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.