Larry F. Grohman

HY Hydril: 2 patents #45 of 135Top 35%

📍 Spring, TX: #948 of 2,039 inventorsTop 50%

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

Overall (All Time): #2,349,237 of 4,157,543Top 60%

Patents All Time

Issued Patents All Time

Showing 1–2 of 2 patents

Patent #	Title	Co-Inventors	Date
4603742	Subsurface safety valve	Fred Wong	1986-08-05
4552219	Subsurface safety valve	Fred Wong	1985-11-12