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Expired Canadian patentCanada

Photoconductive communications-transmission fibre with high radiation stability

CA 1114169 A · Owner: Jenaer Glaswerk Schott & Gen. · Inventors: Heinemann, Peter; Meckel, Lothar; Gliemeroth, Georg

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

The invention provides a communications transmitting photoconductive fibre comprising a core of multicomponent glass and an outer wall of SiO2 glass, with a borosilicate glass zone intervening between the core and outer wall wherein, the, multicomponent glass and the borosilicate glass zone are stabilised by a content of Sb2O3 and the multi-component glass is produced with every layer discretely formed by pyrolysis with application of O2 at a temperature of at least 1800°C.

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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 December 15, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 15, 1998.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledSeptember 8, 1978
GrantedDecember 15, 1981
Term endedDecember 15, 1998
Patent numberCA 1114169 A
Classification (IPC)C03C13/04 +1 more

Timeline

Timeline From CIPO dates

1979198119831985198719891991199319951997Application filedSep 8, 1978Patent grantedDec 15, 1981Term endedDec 15, 1998

Sources & verification

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