Susumu Tatsumi

Person

Tokyo, JP

People

Patents Grantslast 30 patents

Information Patent Grant
Method and apparatus for detecting toner concentration of two-compo...
- Patent number 4,640,129
- Issue date Feb 3, 1987
- Seiichi Miyakawa
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information Patent Grant
Method of maintaining the correct conditions of an electrophotograp...
- Patent number RE32330
- Issue date Jan 13, 1987
- Ricoh Co., Ltd.
- Seiichi Miyakawa
- 355 - Photocopying
Information Patent Grant
Thermosensitive image transfer recording medium
- Patent number 4,614,682
- Issue date Sep 30, 1986
- Ricoh Company, Ltd.
- Akira Suzuki
- B41 - PRINTING LINING MACHINES TYPEWRITERS STAMPS
Information Patent Grant
Developing unit for electrophotography
- Patent number 4,423,134
- Issue date Dec 27, 1983
- Ricoh Company, Ltd.
- Seiichi Miyakawa
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information Patent Grant
Process for treating exhaust gas from electrophotographic machine a...
- Patent number 4,415,533
- Issue date Nov 15, 1983
- Ricoh Co., Ltd.
- Tsuneo Kurotori
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information Patent Grant
Electrometer apparatus
- Patent number 4,330,749
- Issue date May 18, 1982
- Ricoh Company, Ltd.
- Tadahiro Eda
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information Patent Grant
Electrometer probe
- Patent number 4,318,042
- Issue date Mar 2, 1982
- Ricoh Company, Ltd.
- Tadahiro Eda
- G01 - MEASURING TESTING
Information Patent Grant
Exposure control and other component control for electrostatic copy...
- Patent number 4,306,804
- Issue date Dec 22, 1981
- Ricoh Company, Ltd.
- Koji Sakamoto
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information Patent Grant
Electrostatographic copying apparatus with automatic toner density...
- Patent number 4,279,498
- Issue date Jul 21, 1981
- Ricoh Company, Ltd.
- Tadahiro Eda
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information Patent Grant
Copy image adjustment method
- Patent number 4,277,549
- Issue date Jul 7, 1981
- Ricoh Company, Ltd.
- Susumu Tatsumi
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information Patent Grant
Variable magnification electrostatic copying machine
- Patent number 4,277,163
- Issue date Jul 7, 1981
- Ricoh Company, Ltd.
- Masumi Ikesue
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information Patent Grant
Electrostatographic apparatus comprising developing bias means
- Patent number 4,266,870
- Issue date May 12, 1981
- Ricoh Company, Ltd.
- Tadahiro Eda
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information Patent Grant
Electrostatographic apparatus comprising automatic document type de...
- Patent number 4,239,374
- Issue date Dec 16, 1980
- Ricoh Company, Ltd.
- Susumu Tatsumi
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information Patent Grant
Electrostatic copying machine
- Patent number 4,226,525
- Issue date Oct 7, 1980
- Ricoh Company, Ltd.
- Koji Sakamoto
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information Patent Grant
Method of maintaining the correct conditions of an electrophotograp...
- Patent number 4,215,930
- Issue date Aug 5, 1980
- Ricoh Company, Limited
- Seiichi Miyakawa
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information Patent Grant
Electrostatographic apparatus comprising improved developing bias c...
- Patent number 4,213,693
- Issue date Jul 22, 1980
- Ricoh Company, Ltd.
- Chikara Imai
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information Patent Grant
Apparatus for sensing toner density using a stationary ferromagneti...
- Patent number 4,210,864
- Issue date Jul 1, 1980
- Ricoh Company, Ltd.
- Seiichi Miyakawa
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information Patent Grant
Electrostatographic apparatus comprising document density sensing m...
- Patent number 4,200,391
- Issue date Apr 29, 1980
- Ricoh Company, Ltd.
- Koji Sakamoto
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information Patent Grant
Apparatus for sensing deterioration of developing substance includi...
- Patent number 4,195,260
- Issue date Mar 25, 1980
- Ricoh Company, Ltd.
- Koji Sakamoto
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information Patent Grant
Electrophotographic copying apparatus
- Patent number 4,176,942
- Issue date Dec 4, 1979
- Ricoh Company, Ltd.
- Susumu Tatsumi
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information Patent Grant
Auto-bias developing process and an electrophotographic copying mac...
- Patent number 4,168,329
- Issue date Sep 18, 1979
- Ricoh Co., Ltd.
- Seiichi Miyakawa
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information Patent Grant
Auto-bias developing apparatus
- Patent number 4,139,299
- Issue date Feb 13, 1979
- Ricoh Company, Ltd.
- Seiichi Miyakawa
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY

Susumu Tatsumi

Person

Patents Grantslast 30 patents

Method and apparatus for detecting toner concentration of two-compo...

Method of maintaining the correct conditions of an electrophotograp...

Thermosensitive image transfer recording medium

Developing unit for electrophotography

Process for treating exhaust gas from electrophotographic machine a...

Electrometer apparatus

Electrometer probe

Exposure control and other component control for electrostatic copy...

Electrostatographic copying apparatus with automatic toner density...

Copy image adjustment method

Variable magnification electrostatic copying machine

Electrostatographic apparatus comprising developing bias means

Electrostatographic apparatus comprising automatic document type de...

Electrostatic copying machine

Method of maintaining the correct conditions of an electrophotograp...

Electrostatographic apparatus comprising improved developing bias c...

Apparatus for sensing toner density using a stationary ferromagneti...

Electrostatographic apparatus comprising document density sensing m...

Apparatus for sensing deterioration of developing substance includi...

Electrophotographic copying apparatus

Auto-bias developing process and an electrophotographic copying mac...

Auto-bias developing apparatus