Ralph R. Swenson

📍 Coulterville, CA: #3 of 4 inventorsTop 75%

🗺 California: #149,087 of 386,348 inventorsTop 40%

Overall (All Time): #1,633,217 of 4,157,543Top 40%

Patents All Time

Issued Patents All Time

Showing 1–3 of 3 patents

Patent #	Title	Co-Inventors	Date
5894856	Seismically triggered valve	Dale Dean	1999-04-20
5893384	Seismically triggered valve with manual override	—	1999-04-13
D403409	Seismically triggered valve	Dale Dean	1998-12-29