Polybenzazole fibers and their ulilization
CA 2406462 A1 · Owner: Kitagawa, Tooru · Inventors: Kaji, Atsushi; Kitagawa, Tooru; Sugihara, Hideki
Overview
Its claims, description and drawings are in the Canadian Patents Database.
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Abstract From the Canadian patent
A polybenzasol fiber having a mean square roughness of the surface thereof of 20 nm or less; and a polybenzasol fiber having an X-ray meridian diffraction half-width factor of 0.3 ~/Gpa or less; and the use thereof for example, in , producing an impact-resistant member and a heat-resistant felt.
Read the whole patent
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.
Why it's free to use
- Filed April 27, 2001. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended April 27, 2021.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 27, 2023.
- 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.