Inventor
Kenkichi Umeda
Inventor
Tokyo, JP
Overview
Patents· 8 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 transducer64%
G01RMeasuring electric variables9%
G09BEducational or demonstration appliances9%
H02KDynamo-electric machines9%
H04NPictorial communication, e.g. television9%
PatentTitleYear
4,445,150'Recording in a single track visual signals associated with audio signals recorded in opposed directions in plural tracks'19844,167,692'Brush-less DC motor'19794,139,875'Cassette and card recording and/or reproducing apparatus'19794,079,426'Tape speed switching multiple track tape recorder'19784,041,453'Signal handling system for minimizing dropout effect'19774,038,692'Tape sensing device for magnetic tape recording and/or reproducing apparatus'19774,005,480'Tape cassette and machine'19773,940,799'Tape cassette with erasure prevention recesses at rear corners'1976Career & activity timeline
Assembled from patent assignee/location history and declaration credentials.
1976–1984Patents assigned to SONY CORP (8)· patent assignee history
1976–1984Based in Tokyo, JP· patent location history
Inventor activity
Assignee and location history derived from the patent record.
Assignees
| Assignee | Patents | Span |
|---|---|---|
| SONY CORP | 8 | 1976–1984 |
Locations
| Location | Patents | Span |
|---|---|---|
| Tokyo, JP | 8 | 1976–1984 |