Process for the conversion of pitch into crystalloidal pitch
CA 1051806 A · Owner: Kureha Kagaku Kogyo Kabushiki Kaisha · Inventors: Kawai, Yoshio; Tamura, Humio; Asano, Kiro
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
PROCESS FOR THE CONVERSION OF PITCH, INTO CRYSTALLOIDAL PITCH ABSTRACT OF THE DISCLOSURE:, Crystalloidal pitch is obtained by subjecting solid pitch particles measuring not more than 5 mm in cross-sectional equivalent diameter to a treatment for proofing the individual particles against mutual fusion and subsequently bringing the fusion-proofed solid pitch particles into contact with a nonoxidative gas at temperatures of from 350°C to 550°C and during the contact, allowing the solid pitch particles to retain a void ratio of not less than 30% by volume. The crystalloid pitch is useful as a precursor for various carbon products.
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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 April 3, 1979. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 3, 1996.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.