Inventor
Takayuki Maruta
Inventor
Tokyo, JP
Overview
Patents· 25 as inventor
Public. Assignee & technology derived from the patent record. Each patent links to its LexDana page.
G03Gprimary
G03GElectrography89%
H04NPictorial communication, e.g. television11%
PatentTitleYear
RE041934'Image forming system'20107,474,867'Magnetic carrier, two-component developer, development method, development device and image forming apparatus of electrophotography'20097,174,124'Tandem color image forming apparatus with an image transfer belt and backup roller'20077,161,712'Apparatus for forming images with proper gamma correction'20077,139,512'Charging device, process cartridge and image forming apparatus'20067,139,517'Developing method for an image forming apparatus and developing device using the same'20066,823,149'Image forming apparatus with variable speed transferring and fixing devices'20046,535,707'Image forming system'20036,226,481'Image forming apparatus with control over developing unit during an idle running of an intermediate image transfer body'20016,160,569'Image forming apparatus capable of changing process line speed'20006,055,386'Apparatus and method for detecting developing ability of an image forming apparatus with varied LED continuous lighting time for image forming and process control modes'20005,881,334'Image forming apparatus and method for preventing wasted toner'19995,860,038'Apparatus and method for detecting developing ability of an image forming apparatus'19995,835,825'Color image forming device having a revolver developing unit'19985,826,146'Color image forming device which changes developing bias when switching between developer units'19985,724,634'Image forming device in which developer roller speed is controlled in developer transfer to a photoconductive drum'19985,671,470'Color image forming device which changes developing bias when switching between developer units'19975,424,809'Image forming method and apparatus for the same'19955,384,628'Developing device for image forming equipment'19955,298,944'Testing image density to control toner concentration and dynamic range in a digital copier'19945,293,198'Image forming apparatus for controlling the dynamic range of an image'19945,270,783'Image forming equipment having improved toner sensing'19935,237,369'Color image forming equipment responsive to changes in ambient conditions'19935,227,842'Electrophotographic image forming apparatus which controls developer bias based on image irregularity'19934,916,547'Color image forming apparatus'1990Career & activity timeline
Assembled from patent assignee/location history and declaration credentials.
1990–2009Patents assigned to RICOH KK (23)· patent assignee history
1990–2010Based in Tokyo, JP· patent location history
1995Patents assigned to RICOH COMAPANY LTD (1)· patent assignee history
1999–2009Based in Yokohama, JP· patent location history
2001–2007Based in Kanagawa, JP· patent location history
2010Patents assigned to RICOH CO LTD (1)· patent assignee history
Inventor activity
Assignee and location history derived from the patent record.
Assignees
| Assignee | Patents | Span |
|---|---|---|
| RICOH KK | 23 | 1990–2009 |
| RICOH CO LTD | 1 | 2010 |
| RICOH COMAPANY LTD | 1 | 1995 |
Locations
| Location | Patents | Span |
|---|---|---|
| Tokyo, JP | 14 | 1990–2010 |
| Yokohama, JP | 6 | 1999–2009 |
| Kanagawa, JP | 5 | 2001–2007 |