Charles F. Sprague

GR Groth: 2 patents #3 of 5Top 60%

📍 Houston, TX: #8,651 of 21,073 inventorsTop 45%

🗺 Texas: #52,441 of 125,132 inventorsTop 45%

Overall (All Time): #2,251,397 of 4,157,543Top 55%

Patents All Time

Issued Patents All Time

Showing 1–2 of 2 patents

Patent #	Title	Co-Inventors	Date
5992449	Pilot operated safety relief valve adapted for low fluid pressures	—	1999-11-30
5931188	Diaphragm operated regulator valve for maintaining low gas pressure	—	1999-08-03