Inventor
Tomofumi Okubo
Inventor
Narashino, JP
Overview
Patents· 10 as inventor
Public. Assignee & technology derived from the patent record. Each patent links to its LexDana page.
H02Pprimary
H02PControl or regulation of electric motors, electric generators or dynamo-electric converters35%
H04LTransmission of digital information, e.g. telegraphic communication18%
G06FElectric digital data processing12%
H02MApparatus for conversion between ac and ac, between ac and dc, or between dc and dc, and for use with mains or similar power supply systems12%
B60LPropulsion of electrically-propelled vehicles6%
B66BElevators6%
F04CRotary-piston, or oscillating-piston, positive-displacement machines for liquids6%
Y02TClimate change mitigation technologies related to transportation6%
PatentTitleYear
10,728,273Systems, devices, and methods for detecting and mitigating domain name registrations used for malicious behavior202010,644,638Electric motor system202010,432,584Managing lame delegated domains within a managed DNS service201910,326,794Anycast-based spoofed traffic detection and mitigation20199,136,788'Motor controller, air compressor, air conditioner, controller of passenger conveyor and controller of conveyor'20157,276,876'Synchronous motor driving apparatus'20077,064,514'Motor drive system for AC motors'20067,030,589'Driving systems of AC motor'20066,954,050'Control method and control device of permanent-magnet type synchronous motor'20056,169,670'Inverter apparatus operatable over extended frequency range while suppressing output error'2001Career & activity timeline
Assembled from patent assignee/location history and declaration credentials.
2001–2015Patents assigned to HITACHI LTD (2)· patent assignee history
2001Based in Funabashi, JP· patent location history
2005–2007Patents assigned to HITACHI IND EQUIPMENT SYS (3)· patent assignee history
2005–2015Based in Narashino, JP· patent location history
2006Patents assigned to HITACHI HOME & LIFE SOLUTIONS (1)· patent assignee history
2015Patents assigned to HASE MASAKAZU (1)· patent assignee history
2019–2020Patents assigned to VERISIGN INC (3)· patent assignee history
2019Based in Herndon, VA, US· patent location history
2020Based in Arlington, VA, US· patent location history
2020Based in Tokyo, JP· patent location history
Inventor activity
Assignee and location history derived from the patent record.
Assignees
| Assignee | Patents | Span |
|---|---|---|
| HITACHI IND EQUIPMENT SYS | 3 | 2005–2007 |
| VERISIGN INC | 3 | 2019–2020 |
| HITACHI LTD | 2 | 2001–2015 |
| HASE MASAKAZU | 1 | 2015 |
| HITACHI HOME & LIFE SOLUTIONS | 1 | 2006 |
Locations
| Location | Patents | Span |
|---|---|---|
| Narashino, JP | 5 | 2005–2015 |
| Herndon, Virginia, US | 2 | 2019 |
| Arlington, Virginia, US | 1 | 2020 |
| Tokyo, JP | 1 | 2020 |
| Funabashi, JP | 1 | 2001 |