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Expired Canadian patentCanada

Vapor-grown and graphitized carbon fibers, process for preparing same, molded members thereof, and composite members thereof

CA 2099808 C · Owner: Niiyama, Masanori · Inventors: Harada, Minoru; Niiyama, Masanori

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Abstract From the Canadian patent

There are disclosed vapor-grown and graphitized carbon fibers capable of forming composite materials having the vapor-grown and graphitized carbon fibers Contained at a high packing density and forming molded members consisting substantially solely of the vapor-grown and graphitized carbon fibers a process for, the preparation of the vapor-grown and graphitized carbon fibers, the molded member, and the composite member. The vapor-grown and graphitized carbon fibers have a mean fiber diameter of 5 µm or smaller a, mean fiber length of 90 µm or shorter a mean aspect, ratio of frame 1 to 18, and a spin density of 8 x 10 1a spins/g or less, when measured by the electron spin resonance …

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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

  • Filed July 5, 1993 and granted November 7, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 5, 2013.
  • A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 5, 2015.
  • 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 5, 1993
GrantedNovember 7, 2000
Term endedJuly 5, 2013
Patent numberCA 2099808 C
Classification (IPC)D01F9/12 +2 more

Timeline

Timeline From CIPO dates

1994199619982000200220042006200820102012Application filedJuly 5, 1993Patent grantedNov 7, 2000Term endedJuly 5, 2013

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