Inventor
Nobuhiro Umebayashi
Inventor
Tsukuba, JP
Overview
Patents· 12 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 transducer52%
Y10STechnical subjects covered by former uspc cross-reference art collections [xracs] and digests14%
Y10TTechnical subjects covered by former us classification14%
B29CShaping or joining of plastics5%
B29LIndexing scheme associated with subclass b29c, relating to particular articles5%
C23CCoating metallic material5%
G06VImage or video recognition or understanding5%
PatentTitleYear
7,728,902'Imaging device and biometrics authentication apparatus'20105,952,074'Magnetic recording medium'19995,789,062'Magnetic recording medium'19985,774,313'Magnetic disk which reduces deterioration in regenerated signals due to optical servo grooves'19985,756,130'Stamper for producing recording medium'19985,587,860'Magnetic disc cartridge including a magnetic disc having a cleaning sheet composed of a non-theroplastic fiber'19965,430,594'Magnetic recording medium'19955,355,270'Magnetic recording medium having a reference track structure for improved optical tracking'19945,319,507'Recording/reproducing system using a flexible magnetic disk'19944,875,121'Magnetic head supporting device'19894,796,129'Magnetic head device for improving head placement on a magnetic disc'19894,695,910'Recording disc cartridge having an improved hub assembly'1987Career & activity timeline
Assembled from patent assignee/location history and declaration credentials.
1987–2010Patents assigned to HITACHI MAXELL (11)· patent assignee history
1987Based in Yuki, JP· patent location history
1989–2010Based in Ibaraki, JP· patent location history
1989Based in Ibaragi, JP· patent location history
1994–1999Based in Tsukuba, JP· patent location history
1998Patents assigned to HITACHI LTD (1)· patent assignee history
1998Patents assigned to HITACI MAXELL LTD (1)· patent assignee history
Inventor activity
Assignee and location history derived from the patent record.
Assignees
| Assignee | Patents | Span |
|---|---|---|
| HITACHI MAXELL | 11 | 1987–2010 |
| HITACHI LTD | 1 | 1998 |
| HITACI MAXELL LTD | 1 | 1998 |
Locations
| Location | Patents | Span |
|---|---|---|
| Tsukuba, JP | 8 | 1994–1999 |
| Ibaraki, JP | 2 | 1989–2010 |
| Ibaragi, JP | 1 | 1989 |
| Yuki, JP | 1 | 1987 |