DC

David W. Caldwell

TT Touchsensor Technologies: 19 patents #1 of 38Top 3%
AL Alsentis: 9 patents #1 of 4Top 25%
DO Donnelly: 6 patents #82 of 274Top 30%
MS Material Handling Systems: 5 patents #4 of 31Top 15%
DT Donnelly Technology: 2 patents #6 of 10Top 60%
General Motors: 2 patents #6,250 of 18,328Top 35%
ST Steelcase: 1 patents #504 of 809Top 65%
📍 Holland, MI: #22 of 1,299 inventorsTop 2%
🗺 Michigan: #862 of 86,293 inventorsTop 1%
Overall (All Time): #50,463 of 4,157,543Top 2%
52
Patents All Time

Issued Patents All Time

Showing 51–52 of 52 patents

Patent #TitleCo-InventorsDate
4947053 High DC voltage power supply for motor vehicle electrical system Robert W. Campbell, Donald O. Ruff 1990-08-07
4780619 High DC voltage power supply for motor vehicle electrical system Robert W. Campbell, Donald O. Ruff 1988-10-25