Patent · US Active

Cellulose powder

US11390690B2 · kind B2 · utility

0Cited by

1References

8Claims

0Family size

Assignee

ASAHI KASEI CHEMICALS CORPORATION · JP

Inventors

Kazuhiro Obae · Nobeoka, JP
Masayuki Kakizawa · Tokyo, JP
Mitsuo Yamashita · Kawasaki, JP

Key dates

Filing date	May 10, 2019
Grant date	Jul 19, 2022
Priority date	—
Expiry date	Jan 22, 2041

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08L2205/18
WIPO fieldPharmaceuticals
WIPO sectorChemistry

Abstract

This cellulose powder has: an average degree of polymerization of 100 to 350; a weight average particle size of over 30 μm, but less than 250 μm; an apparent specific volume of 2 to less than 15 cm3/g; and an organic carbon content from residual impurities, which is defined by the total organic carbon content (%) during 1% NaOH extraction to the total organic carbon content (%) during pure water extraction, of over 0.07 to 0.3%.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.