Ikuko Yamada

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Kawasaki, JP

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Patents Grantslast 30 patents

Information Patent Grant
Aqueous ink compositions and ink-jet printing method using the same
- Patent number 6,231,652
- Issue date May 15, 2001
- Ricoh Company, Ltd.
- Masayuki Koyano
- C09 - DYES PAINTS POLISHES NATURAL RESINS ADHESIVES MISCELLANEOUS COMPOSITION...
Information Patent Grant
Aqueous ink composition and ink-jet printing method using the same
- Patent number 5,972,082
- Issue date Oct 26, 1999
- Ricoh Company, Ltd.
- Masayuki Koyano
- C09 - DYES PAINTS POLISHES NATURAL RESINS ADHESIVES MISCELLANEOUS COMPOSITION...
Information Patent Grant
Cyclopentadiene derivative compounds and electrophotographic photoc...
- Patent number 5,750,762
- Issue date May 12, 1998
- Ricoh Company, Ltd.
- Megumi Kawahara
- C07 - ORGANIC CHEMISTRY
Information Patent Grant
cyclopentadiene derivative compounds and electrophotographic photoc...
- Patent number 5,700,614
- Issue date Dec 23, 1997
- Ricoh Company, Ltd.
- Megumi Kawahara
- C07 - ORGANIC CHEMISTRY