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Expired Canadian patentCanada

Filter press of movable twin head type

CA 1196580 A · Owner: Ishigaki Kiko Co. Ltd. · Inventors: Iwatani, Akitoshi

CIPO record

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

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Abstract From the Canadian patent

This invention relates to a filter press in which between a pair of heads a plurality of filter plates are connected to one another by loose connecting means. In the improved apparatus, the heads are both movable so that the filter plates may be moved in sequence simultaneously from, both end sides, toward the center to close the intervals therebetween or away from the center to provide intervals therebetween, whereby the time required in assembling and separating the filter plates can be considerably reduced. When the filter plates in assembled state, if one of the heads is pressed while, the other head is placed under action of stoppers the filter, plates are vigorously tightened by a …

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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 November 12, 1985. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 12, 2002.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledDecember 2, 1982
GrantedNovember 12, 1985
Term endedNovember 12, 2002
Patent numberCA 1196580 A
Classification (IPC)B01D25/12

Timeline

Timeline From CIPO dates

1983198519871989199119931995199719992001Application filedDec 2, 1982Patent grantedNov 12, 1985Term endedNov 12, 2002

Sources & verification

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