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Expired Canadian patentCanada

Membraneous synthetic zeolite and process for producing the same

CA 1235684 A · Owner: Toa Nenryo Kogyo K.K. · Inventors: Maeshima, Tsugio; Tagaya, Nobuaki; Isoda, Takeshi

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Abstract From the Canadian patent

This invention discloses a membraneous zeolite having a thickness of 1 µ m to 500 µ m and the production conditions to form the same. Since the membraneous zeolite of this invention consists almost of crystalline synthetic zeolite it is expected to have excellent abilities for material separation. The thickness of this membrane can be controlled easily by adjusting pH of aqueous reaction mixture. At least one organic nitrogen containing cation have to be contained in the aqueous reaction mixture to form membraneous zeolite of present invention. The preferred composition of starting materials are also disclosed.

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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 April 26, 1988. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 26, 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.
FiledOctober 10, 1984
GrantedApril 26, 1988
Term endedApril 26, 2005
Patent numberCA 1235684 A
Classification (IPC)B01J29/04 +2 more

Timeline

Timeline From CIPO dates

1985198819911994199720002003Application filedOct 10, 1984Patent grantedApril 26, 1988Term endedApril 26, 2005

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