Inventor
Donald C. Simpson
Inventor
Norton, MA, US
Overview
Patents· 9 as inventor
Public. Assignee & technology derived from the patent record. Each patent links to its LexDana page.
G01Lprimary
G01LMeasuring force, stress, torque, work, mechanical power, mechanical efficiency, or fluid pressure31%
Y10TTechnical subjects covered by former us classification25%
F15BSystems acting by means of fluids in general13%
G05DSystems for controlling or regulating non-electric variables13%
H01FMagnets13%
Y10STechnical subjects covered by former uspc cross-reference art collections [xracs] and digests6%
PatentTitleYear
5,257,639'Electropneumatic positioner'19935,159,949'Electropneumatic positioner'1992RE033028'Electropneumatic transducer system'1989D0291917'Disposable cushion pad for intra-oral X-ray films'1987D0290652'Cushion pad for intra-oral X-ray films'19874,527,583'Electropneumatic transducer system'1985RE031416'Electric signal transmitter for vibrating-wire sensor'19834,165,652'Vibratable-wire instrument having an improved temperature compensating technique'19794,118,977'Electric signal transmitter for vibrating-wire sensor'1978Career & activity timeline
Assembled from patent assignee/location history and declaration credentials.
1978Patents assigned to FOXBORO CO (1)· patent assignee history
1978–1993Based in Norton, MA, US· patent location history
1979–1987Patents assigned to SIMPSON DONALD C (3)· patent assignee history
1979Patents assigned to CROIX JAMES R (1)· patent assignee history
1979Patents assigned to OLSEN EVERETT O (1)· patent assignee history
1985–1993Patents assigned to DRESSER IND (3)· patent assignee history
1987Based in Sierra Vista, AZ, US· patent location history
Inventor activity
Assignee and location history derived from the patent record.
Assignees
| Assignee | Patents | Span |
|---|---|---|
| DRESSER IND | 3 | 1985–1993 |
| SIMPSON DONALD Cself | 3 | 1979–1987 |
| CROIX JAMES R | 1 | 1979 |
| FOXBORO CO | 1 | 1978 |
| OLSEN EVERETT O | 1 | 1979 |
Locations
| Location | Patents | Span |
|---|---|---|
| Norton, Massachusetts, US | 7 | 1978–1993 |
| Sierra Vista, AZ, US | 2 | 1987 |