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Expired Canadian patentCanada

Optical waveguide with a core-jacket structure

CA 1290176 C · Owner: Siemens Aktiengesellschaft · Inventors: Herbrechtsmeier, Peter; FLEIßNER, MANFRED; Wieners, Gerhard

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

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Abstract From the Canadian patent

Optical waveguides of plastic usually consist of a core and a jacket, the core material having a higher refractive index than the jacket material. A suitable core material is a fluorine-free polymer and a suitable jacket material is a fluorine-containing polymer, which can also contain deuterium. The optical waveguides can be produced by passing a polymer rod through a solution of the jacket polymer and then removing the solvent. The optical waveguides are particularly suitable for the transmission of data with the aid of light waves with a wavelength of 500 to 750 nm.

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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 October 8, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended October 8, 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.
FiledMarch 5, 1987
GrantedOctober 8, 1991
Term endedOctober 8, 2008
Patent numberCA 1290176 C
Classification (IPC)G02B6/02 +2 more

Timeline

Timeline From CIPO dates

1988199119941997200020032006Application filedMarch 5, 1987Patent grantedOct 8, 1991Term endedOct 8, 2008

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