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Expired Canadian patentCanada

Process for preparing derivatives of maltose

CA 1289953 C · Owner: Mitsuhashi, Masakazu · Inventors: Miyake, Toshio; Mitsuhashi, Masakazu; Sakai, Shuzo

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Overview

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Its claims, description and drawings are in the Canadian Patents Database.

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Abstract From the Canadian patent

There are disclosed a novel process for preparing maltose derivatives. This new process is characterized by allowing crystalline alpha-maltose, specifically, that with an alpha-maltose isomer content of 55% or higher, to react with a reagent under anhydrous conditions. According to this process high-quality maltose derivatives, can be obtained easily and at a consistently high yield.

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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 1, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended October 1, 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.
FiledNovember 21, 1986
GrantedOctober 1, 1991
Term endedOctober 1, 2008
Patent numberCA 1289953 C
Classification (IPC)C07H3/04 +2 more

Timeline

Timeline From CIPO dates

19871990199319961999200220052008Application filedNov 21, 1986Patent grantedOct 1, 1991Term endedOct 1, 2008

Sources & verification

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