HJ

Henry D. Calk, Jr.

VG Vetco Gray: 1 patents #168 of 364Top 50%
📍 Richmond, TX: #353 of 594 inventorsTop 60%
🗺 Texas: #73,555 of 125,132 inventorsTop 60%
Overall (All Time): #3,918,271 of 4,157,543Top 95%
1
Patents All Time

Issued Patents All Time

Showing 1–1 of 1 patents

Patent #TitleCo-InventorsDate
4795128 Gate type kelly cock valve Igor Krasnov, Taylor L. Jones, Billy L. McDougal 1989-01-03