Inventor
Hirofumi Sakurai
Inventor
Hitachi, JP
Overview
Patents· 5 as inventor
Public. Assignee & technology derived from the patent record. Each patent links to its LexDana page.
F04Dprimary
F04DNon-positive-displacement pumps20%
H04NPictorial communication, e.g. television20%
Y10STechnical subjects covered by former uspc cross-reference art collections [xracs] and digests20%
E02DFoundations10%
F16CShafts10%
G06FElectric digital data processing10%
H03LAutomatic control, starting, synchronisation or stabilisation of generators of electronic oscillations or pulses10%
PatentTitleYear
7,679,679'Synchronous detector'20106,304,118'Synchronous circuit having circuit for detecting phase error at center of reference signal'20015,987,460'Document retrieval-assisting method and system for the same and document retrieval service using the same with document frequency and term frequency'19995,501,583'Turbo vacuum pump'19965,380,171'Turbo vacuum pump'1995Career & activity timeline
Assembled from patent assignee/location history and declaration credentials.
1995–1999Patents assigned to HITACHI LTD (3)· patent assignee history
1995–1996Based in Hitachi, JP· patent location history
1999Based in Saitama, JP· patent location history
2001Patents assigned to NEC CORP (1)· patent assignee history
2001Based in Tokyo, JP· patent location history
2010Patents assigned to NEC ELECTRONICS CORP (1)· patent assignee history
2010Based in Kanagawa, JP· patent location history
Inventor activity
Assignee and location history derived from the patent record.
Assignees
| Assignee | Patents | Span |
|---|---|---|
| HITACHI LTD | 3 | 1995–1999 |
| NEC CORP | 1 | 2001 |
| NEC ELECTRONICS CORP | 1 | 2010 |
Locations
| Location | Patents | Span |
|---|---|---|
| Hitachi, JP | 2 | 1995–1996 |
| Kanagawa, JP | 1 | 2010 |
| Tokyo, JP | 1 | 2001 |
| Saitama, JP | 1 | 1999 |