Inventor
Ken Ishitobi
Inventor
Shiojiri, JP
Overview
Patents· 9 as inventor
Public. Assignee & technology derived from the patent record. Each patent links to its LexDana page.
C09Kprimary
C09KMaterials for miscellaneous applications, not provided for elsewhere35%
C09GPolishing compositions26%
B24DTools for grinding, buffing or sharpening13%
C23FNon-mechanical removal of metallic material from surface13%
G11BInformation storage based on relative movement between record carrier and transducer9%
B24BMachines, devices, or processes for grinding or polishing4%
PatentTitleYear
6,607,571'Polishing composition and method'20036,488,729'Polishing composition and method'20026,152,976'Abrasive composition for disc substrate, and process for polishing disc substrate'20005,935,278'Abrasive composition for magnetic recording disc substrate'19995,626,640'Composition adapted for use in texturing process for magnetic disc'19975,609,657'Composition for texturing magnetic disk'19974,929,257'Abrasive composition and process for polishing'19904,915,710'Abrasive composition and process for polishing'19904,883,502'Abrasive composition and process for polishing'1989Career & activity timeline
Assembled from patent assignee/location history and declaration credentials.
1989–2003Patents assigned to SHOWA DENKO KK (9)· patent assignee history
1989–2003Based in Shiojiri, JP· patent location history
1990Patents assigned to YAMAGUCHI SEIKEN KOGYO KABUSHI (1)· patent assignee history
1990Patents assigned to YAMAGUCHI SEIKEN KOGYO KK (1)· patent assignee history
1997Based in Tokyo, JP· patent location history
2002–2003Patents assigned to YAMAGUCHI SEIKEN KOGYO K K (2)· patent assignee history
Inventor activity
Assignee and location history derived from the patent record.
Assignees
| Assignee | Patents | Span |
|---|---|---|
| SHOWA DENKO KK | 9 | 1989–2003 |
| YAMAGUCHI SEIKEN KOGYO K K | 2 | 2002–2003 |
| YAMAGUCHI SEIKEN KOGYO KABUSHI | 1 | 1990 |
| YAMAGUCHI SEIKEN KOGYO KK | 1 | 1990 |
Locations
| Location | Patents | Span |
|---|---|---|
| Shiojiri, JP | 8 | 1989–2003 |
| Tokyo, JP | 1 | 1997 |