Hiroyuki Oka

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Hitachi, JP

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Patents Grantslast 30 patents

Information Patent Grant
Heat transfer ink sheet having a precoating layer which is thermall...
- Patent number 5,116,148
- Issue date May 26, 1992
- Hitachi, Ltd.
- Shuichi Ohara
- B41 - PRINTING LINING MACHINES TYPEWRITERS STAMPS
Information Patent Grant
Color ink sheet for thermal transfer
- Patent number 4,812,439
- Issue date Mar 14, 1989
- Hitachi, Ltd.
- Shuichi Ohara
- B41 - PRINTING LINING MACHINES TYPEWRITERS STAMPS
Information Patent Grant
Thermal transfer sheet
- Patent number 4,690,858
- Issue date Sep 1, 1987
- Hitachi, Ltd.
- Hiroyuki Oka
- B41 - PRINTING LINING MACHINES TYPEWRITERS STAMPS
Information Patent Grant
Composite type photosensitive member having metal-free phthalocyani...
- Patent number 4,619,879
- Issue date Oct 28, 1986
- Hitachi, Ltd.
- Atsushi Kakuta
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information Patent Grant
Electrophotographic recording medium containing .tau. and .eta. met...
- Patent number 4,507,374
- Issue date Mar 26, 1985
- Hitachi, Ltd.
- Atsushi Kakuta
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information Patent Grant
Complex type electrophotographic plate and electrophotographic meth...
- Patent number 4,352,876
- Issue date Oct 5, 1982
- Hitachi, Ltd.
- Shigeo Suzuki
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY