Inventor
Shinji Umeki
Inventor
Tokyo, JP
Overview
Patents· 16 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 transducer38%
Y10STechnical subjects covered by former uspc cross-reference art collections [xracs] and digests14%
Y10TTechnical subjects covered by former us classification14%
C01GCompounds containing metals not covered by subclasses c01d or c01f10%
C01PIndexing scheme relating to structural and physical aspects of solid inorganic compounds10%
B22FWorking metallic powder5%
B05DProcesses for applying fluent materials to surfaces, in general2%
B82YSpecific uses or applications of nanostructures2%
C23CCoating metallic material2%
H01FMagnets2%
PatentTitleYear
4,451,502'Method for manufacturing magnetic recording medium'19844,363,831'Process for producing magnetic powder having high coercive force'19824,323,464'Process for producing hydrated iron oxide having silicon and phosphorus component'19824,321,302'Process for producing magnetic powder having high coercive force'19824,311,684'Process for producing iron oxide containing magnetite'19824,305,921'Process for producing iron oxide'19814,302,510'Magnetic recording medium'19814,255,409'Process for producing acicular goethite'19814,251,504'Process for producing acicular goethite'19814,112,184'Magnetic recording medium and method of preparing'19784,069,367'Magnetic powder material comprising iron oxide particles with a copper-cobalt alloy coating'19784,067,755'Method of making powdered magnetic iron oxide material'19784,010,310'Magnetic powder'19773,977,985'Magnetic recording medium comprising cobalt or cobalt alloy coated particles of spicular magnetite'19763,958,068'Process for the production of powdered magnetic material'19763,953,656'Magnetic recording medium and preparation thereof'1976Career & activity timeline
Assembled from patent assignee/location history and declaration credentials.
1976–1982Patents assigned to TDK ELECTRONICS CO LTD (15)· patent assignee history
1976–1982Based in Tokyo, JP· patent location history
1976–1978Based in Saku, JP· patent location history
1984Patents assigned to TAKADA KAZUO (1)· patent assignee history
1984Patents assigned to UMEKI SHINJI (1)· patent assignee history
1984Based in Nagano, JP· patent location history
Inventor activity
Assignee and location history derived from the patent record.
Assignees
| Assignee | Patents | Span |
|---|---|---|
| TDK ELECTRONICS CO LTD | 15 | 1976–1982 |
| TAKADA KAZUO | 1 | 1984 |
| UMEKI SHINJIself | 1 | 1984 |
Locations
| Location | Patents | Span |
|---|---|---|
| Tokyo, JP | 12 | 1976–1982 |
| Saku, JP | 3 | 1976–1978 |
| Nagano, JP | 1 | 1984 |