Inventor
Yasuo Sawada
Inventor
Tokyo, JP
Overview
Patents· 13 as inventor
Public. Assignee & technology derived from the patent record. Each patent links to its LexDana page.
G11Bprimary
G11BInformation storage based on relative movement between record carrier and transducer41%
Y10STechnical subjects covered by former uspc cross-reference art collections [xracs] and digests18%
Y10TTechnical subjects covered by former us classification18%
G03GElectrography14%
C23CCoating metallic material5%
H01FMagnets5%
PatentTitleYear
7,236,448'Optical information recording medium and information recording method using the recording medium'20077,187,642'Optical information recording medium with ROM area having pre-pits'20077,106,680'Device and method for recording data to optical disk using multi-pulse to enhance power pulse'20066,982,110'Information recording medium and manufacturing method thereof'20066,469,963'Optical recording medium and method of information recording/reading an optical recording medium'20026,137,769'Optical recording medium and method of information recording/reading an optical recording medium'20005,384,167'Method for the surface treatment of a metal by atmospheric pressure plasma'19955,316,814'Optical information recording medium'19944,839,226'Magneto-optical recording medium'19894,690,861'Magneto optical recording medium'19874,389,972'Toner concentration control apparatus'19834,369,733'Toner concentration control apparatus'19834,266,141'Toner developing ability measuring system for electrostatography'1981Career & activity timeline
Assembled from patent assignee/location history and declaration credentials.
1981–2007Patents assigned to RICOH KK (12)· patent assignee history
1981–2006Based in Tokyo, JP· patent location history
1983Based in Sayama, JP· patent location history
1987Based in Numazu, JP· patent location history
1989–2007Based in Machida, JP· patent location history
1995Patents assigned to EC CHEM IND CO (1)· patent assignee history
1995Patents assigned to ITOH C FINE CHEMICAL CO (1)· patent assignee history
1995Patents assigned to NISHIWAKI ATSUSHI (1)· patent assignee history
Inventor activity
Assignee and location history derived from the patent record.
Assignees
| Assignee | Patents | Span |
|---|---|---|
| RICOH KK | 12 | 1981–2007 |
| EC CHEM IND CO | 1 | 1995 |
| ITOH C FINE CHEMICAL CO | 1 | 1995 |
| NISHIWAKI ATSUSHI | 1 | 1995 |
Locations
| Location | Patents | Span |
|---|---|---|
| Tokyo, JP | 6 | 1981–2006 |
| Machida, JP | 4 | 1989–2007 |
| Sayama, JP | 2 | 1983 |
| Numazu, JP | 1 | 1987 |