Hitoshi Kumagai

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Saitama, JP

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Patents Grantslast 30 patents

Information Patent Grant
SULFONATED DERIVATIVES OF CYCLIC PHENOL SULFIDES, PROCESS FOR THE P...
- Patent number 6,355,671
- Issue date Mar 12, 2002
- Cosmo Research Institute
- Sotaro Miyano
- B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
Information Patent Grant
Cyclic phenol sulfide having at least one sulfinyl or sulfonyl grou...
- Patent number 5,998,631
- Issue date Dec 7, 1999
- Cosmo Research Institute
- Hitoshi Kumagai
- C07 - ORGANIC CHEMISTRY
Information Patent Grant
Composition for extracting transition metal and method for extracti...
- Patent number 5,881,358
- Issue date Mar 9, 1999
- Cosmo Research Institute
- Sotaro Miyano
- C22 - METALLURGY FERROUS OR NON-FERROUS ALLOYS TREATMENT OF ALLOYS OR NON-FER...
Information Patent Grant
Cyclic phenol sulfide and process for producing the same
- Patent number 5,824,808
- Issue date Oct 20, 1998
- Cosmo Research Institute
- Takashi Hori
- C07 - ORGANIC CHEMISTRY
Information Patent Grant
Process for producing over-based sulfurized alkaline earth metal ph...
- Patent number 5,178,781
- Issue date Jan 12, 1993
- Cosmo Oil Co., Ltd.
- Takashi Hori
- C07 - ORGANIC CHEMISTRY
Information Patent Grant
Process for producing a mixture of sulfides of alkaline earth metal...
- Patent number 4,902,436
- Issue date Feb 20, 1990
- Cosmo Oil Co., Ltd.
- Takashi Hori
- C07 - ORGANIC CHEMISTRY