Tateki Oka

This inventor holds 59 USPTO granted patents, primarily in Image Formation Technology (CPC class 1186). Top assignees: Minolta Camera Kabushiki Kaisha, Minolta Company, Ltd.. Active years: 1980-2001.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Tateki Oka. Retrieved from https://idiyas.com/inventor/tateki-oka

Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile

USPTO Granted Patents = 59

% Patents Active = 100.0

Average Co-Inventor Count = 2.1

ph-index = 14

Forward Citations = 613(Granted Patents)

Forward Citations (Not Self Cited) = 599(Dec 10, 2025)

Inventors with similar research interests:

Location History:

Sakai, JP (1980 - 1984)
Toyohashhi, JP (1986)
Toyhashi, JP (1986)
Toyokawa, JP (1983 - 1989)
Aichi, JP (1988 - 1989)
Osaka, JP (1990 - 1991)
Atsugi, JP (1993 - 1996)
Toyohashi, JP (1983 - 2001)

Company Filing History:

56 out of 2,979

Minolta Camera Kabushiki Kaisha

patents

3 out of 2,816

Minolta Company, Ltd.

patents

Years Active: 1980-2001

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Areas of Expertise:

Electrophotography

Image Forming Apparatus

Developing Device

Toner Supply

Image Quality Control

Color Imaging

Composite Images

Voltage Control

Developer Conveying

Multi-Color Images

Pressure Control

Toner Handling

59 patents (USPTO):Sort by Forward CitationsExplore Patents

1. 6266508 - Developing apparatus including an AC voltage applying device (2001-07-24),

2. 5781827 - Developing device having a bias-controlled toner discharging member (1998-07-14),

3. 5493324 - Image forming apparatus (1996-02-20),

4. 5365040 - Fixing device having a temperature control system (1994-11-15),

5. 5303016 - Image fixing device for image forming apparatus including means for (1994-04-12),

6. 5287152 - Electric charge supplying device and system employing the same (1994-02-15),

7. 5287146 - Contact type charging device having voltage limiter (1994-02-15),

8. 5283615 - Image forming apparatus having a plurality of developing devices (1994-02-01),

9. 5262828 - Developing bias power unit for use in an image forming apparatus (1993-11-16),

10. 5255062 - Image forming apparatus having a removal means for separating developers (1993-10-19),

11. 5243390 - Device for conveying developer in a developing device (1993-09-07),

12. 5138385 - Developing device with electrically floating developing roller (1992-08-11),

13. 5134444 - Image forming apparatus (1992-07-28),

14. 5122843 - Image forming apparatus having developing devices which use different (1992-06-16),

15. 5065233 - Color image forming apparatus (1991-11-12),

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Profile summary based on public USPTO records.

Data Sources: USPTO Patent Grant XML, Patent Center, EPO & CIPO • Normalized by IDiyas Innovation Graph. Methodology & provenance architecturePlease report any incorrect information to [email protected]