Chuichi Hirayama
5Patents
0Active
5Granted
25Portfolio score
Filing activity: Nov 3, 1987 → Feb 10, 1993
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5498409A | Material for adsorbing pyrogen | Emerging Cross-Sectional Technologies | 12 | Expired |
| US4975542A | Method for preparing granular porous chitosan | Chemistry; Metallurgy | 12 | Expired |
| US5279821A | Pyrogen adsorbent containing amide groups | Emerging Cross-Sectional Technologies | 10 | Expired |
| US4840975A | Spherical grains of polyamino acid and production method thereof | Chemistry; Metallurgy | 2 | Expired |
| US4948816A | Spherical grains of polyamino acid and production method thereof | Chemistry; Metallurgy | 2 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.