Inventor
Akio Yokoyama
Inventor
Ibaraki, JP
Overview
Patents· 13 as inventor
Public. Assignee & technology derived from the patent record. Each patent links to its LexDana page.
H03Fprimary
H03FAmplifiers24%
H03HImpedance networks, e.g. resonant circuits24%
H03GControl of amplification18%
H03MCoding18%
B01DSeparation6%
G11BInformation storage based on relative movement between record carrier and transducer6%
H02PControl or regulation of electric motors, electric generators or dynamo-electric converters6%
PatentTitleYear
8,912,740'Actuator driver'20147,528,659'Fully differential amplification device'20097,474,244'Current addition type digital analog converter'20097,405,636'Passive polyphase filter'20087,271,652'Differential amplifier and operational amplifier'20077,215,195'Differential amplifier and operational amplifier'20077,116,170'Differential amplifier and calculation amplifier'20067,084,797'Delta sigma modulating apparatus'20066,954,161'Cascade delta-sigma modulator'20056,930,544'Filter'20056,512,414'Automatic filter tuning control system'20035,012,201'Variable impedance circuit'19914,001,384'Process for recovery of oxides of sulfur from combustion waste gas'1977Career & activity timeline
Assembled from patent assignee/location history and declaration credentials.
1977Patents assigned to ASAHI GLASS CO LTD (1)· patent assignee history
1977Based in Nishinomiya, JP· patent location history
1991–2008Patents assigned to MATSUSHITA ELECTRIC INDUSTRIAL CO LTD (9)· patent assignee history
1991Based in Nagaokakyo, JP· patent location history
2003–2014Based in Osaka, JP· patent location history
2005–2007Based in Ibaraki, JP· patent location history
2009–2014Patents assigned to PANASONIC CORP (3)· patent assignee history
Inventor activity
Assignee and location history derived from the patent record.
Assignees
| Assignee | Patents | Span |
|---|---|---|
| MATSUSHITA ELECTRIC INDUSTRIAL CO LTD | 9 | 1991–2008 |
| PANASONIC CORP | 3 | 2009–2014 |
| ASAHI GLASS CO LTD | 1 | 1977 |
Locations
| Location | Patents | Span |
|---|---|---|
| Ibaraki, JP | 6 | 2005–2007 |
| Osaka, JP | 5 | 2003–2014 |
| Nagaokakyo, JP | 1 | 1991 |
| Nishinomiya, JP | 1 | 1977 |