Spherical grains of polyamino acid and production method thereof
CA 1293592 C · Owner: Motozato, Yoshiaki · Inventors: Ihara, Hirotaka; Motozato, Yoshiaki; Hirayama, Chuichi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention provides novel spherical grains of poly(.alpha.-amino acid) which can be used as a filler in chromatography, cosmetic powder and the like. The spherical grains can be produced by a method which comprises the steps of preparing a solution of hydrophobic poly(?-amino acid) such as poly n-leucine dissolved in an organic solvent; adding the solution to an aqueous medium and agitating the medium so as to obtain a dispersion of the spherical grains of the poly(.alpha.-amino acid) dispersed in the aqueous medium while evaporating the organic solvent; and taking out the spherical grains of polyamino acid from the dispersion.
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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 December 24, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 24, 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.
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.