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Expired Canadian patentCanada

Process for producing flat glass

CA 1208441 A · Owner: Asahi Glass Company Ltd. · Inventors: Sato, Yasuo; Nomaki, Koji; Mase, Hiroshi

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

A process for producing a flat glass which comprises, withdrawing a glass ribbon substantially horizontally from the surface of a molten metal bath while maintaining the level of the surface of the molten metal at a level higher than an end wall at the outlet of the bath from which the glass ribbon is withdrawn and preventing the overflow of the molten metal from the end wall by means of a force induced by a linear induction motor wherein, side walls at the outlet of the bath are made of an electroconductive material thereby to prevent a drop of the induced force in the vicinity of the side walls.

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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 July 29, 1986. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 29, 2003.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledJuly 6, 1984
GrantedJuly 29, 1986
Term endedJuly 29, 2003
Patent numberCA 1208441 A
Classification (IPC)C03B18/10 +2 more

Timeline

Timeline From CIPO dates

1985198719891991199319951997199920012003Application filedJuly 6, 1984Patent grantedJuly 29, 1986Term endedJuly 29, 2003

Sources & verification

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