Inventor
Fumio Sakuma
Inventor
Sukagawa, JP
Overview
Patents· 8 as inventor
Public. Assignee & technology derived from the patent record. Each patent links to its LexDana page.
D05Bprimary
D05BSewing40%
H02PControl or regulation of electric motors, electric generators or dynamo-electric converters30%
Y10STechnical subjects covered by former uspc cross-reference art collections [xracs] and digests20%
H01CResistors10%
PatentTitleYear
4,251,796'Slide-type potentiometer'19814,246,521'DC Motor speed control system'19814,228,383'Speed control circuit arrangement for an AC commutator motor'19804,168,455'Motor speed control system'19794,143,605'Motor driven sewing machine'19794,142,472'Control apparatus for an electrically driven sewing machine with stitch pattern producing device'19794,085,692'Motor control apparatus for electrically-driven sewing machine'19784,078,507'Electrically driven sewing machine control apparatus'1978Career & activity timeline
Assembled from patent assignee/location history and declaration credentials.
1978–1981Patents assigned to YAMAMOTO ELECTRIC IND CO LTD (6)· patent assignee history
1978Patents assigned to YAMAMOTO ELECTRIC IND CO INC (1)· patent assignee history
1978–1981Based in Sukagawa, JP· patent location history
1980Patents assigned to YAMAMOTO ELECTRIC IND LTD (1)· patent assignee history
Inventor activity
Assignee and location history derived from the patent record.
Assignees
| Assignee | Patents | Span |
|---|---|---|
| YAMAMOTO ELECTRIC IND CO LTD | 6 | 1978–1981 |
| YAMAMOTO ELECTRIC IND CO INC | 1 | 1978 |
| YAMAMOTO ELECTRIC IND LTD | 1 | 1980 |
Locations
| Location | Patents | Span |
|---|---|---|
| Sukagawa, JP | 8 | 1978–1981 |