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Expired Canadian patentCanada

Disc film developing treatment apparatus

CA 1287514 C · Owner: Ikehara, Hiroaki · Inventors: Ikehara, Hiroaki; Mihara, Nobuaki; Nishimoto, Kanichi

CIPO record

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

Developing treatment apparatus for disc films includes a plurality of treatment liquid storing baths required for the developing process. A disc film treatment tank has the treatment liquids successively supplied to it from the treatment baths in accordance with a predetermined order, the treatment liquids being discharged from the tank after use. A waste liquid chamber is defined by a partition wall and an inner peripheral wall of the treatment tank and drains treatment liquids from the liquid introduction pipes extending between the baths and the treatment tank. This is achieved without any mixing of the treatment liquids in the treatment tank. The height and width of the partition wall …

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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 August 13, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended August 13, 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 18, 1987
GrantedAugust 13, 1991
Term endedAugust 13, 2008
Patent numberCA 1287514 C
Classification (IPC)G03D3/02 +1 more

Timeline

Timeline From CIPO dates

1988199119941997200020032006Application filedJune 18, 1987Patent grantedAug 13, 1991Term endedAug 13, 2008

Sources & verification

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