Process of producing optically anisotropic carbonaceous pitch
CA 1180295 A · Owner: Toa Nenryo Kogyo K.K. · Inventors: Izumi, Takayuki; Naito, Tsutomu; Nakamura Tomoo
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A homogeneous optically anisotropic pitch used, for the production of carbon materials is prepared from a starting oil comprising a substantially chloroforminsoluble matter-free oily or tarry substance. The starting oil is subjected to thermal cracking and polycondensation to form approximately 20-80% of optically anisotropic phase pitch.
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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 January 2, 1985. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 2, 2002.
- 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.