RA

Ronald A. Aspinwall

VI Vickers: 2 patents #29 of 188Top 20%
SP Sperry: 1 patents #355 of 841Top 45%
Overall (All Time): #1,681,926 of 4,157,543Top 45%
3
Patents All Time

Issued Patents All Time

Patent #TitleCo-InventorsDate
4457341 Variable pressure drop proportional motor controlled hydraulic directional valve — 1984-07-03
4422475 Variable gain servo controlled directional valve — 1983-12-27
4328950 Magnetic detent for a control valve — 1982-05-11