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Expired Canadian patentCanada

Intercalations of crystalline lithium aluminates

CA 1290137 C · Owner: The Dow Chemical Company · Inventors: Burba, John L. Iii; Bauman, William C.

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Abstract From the Canadian patent

Useful compositions are prepared by incorporating into organic materials, crystalline lithium aluminates which conform substantially to the empirical formula (LiAx)y?2Al(OH)3?nH2O, wherein A is one or more anions and/or negative-valence radicals;, wherein x is a quantity of A ions and/or radicals sufficient to substantially satisfy the valence requirements of the Li;, wherein y is a numerical value sufficient to maintain the crystalline structure; and wherein n represents the number of waters of hydration, if any.

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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 October 8, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended October 8, 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.
FiledJune 10, 1985
GrantedOctober 8, 1991
Term endedOctober 8, 2008
Patent numberCA 1290137 C
Classification (IPC)C01F7/00 +2 more

Timeline

Timeline From CIPO dates

19861989199219951998200120042007Application filedJune 10, 1985Patent grantedOct 8, 1991Term endedOct 8, 2008

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Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.