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Charles A. Hartwell

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

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

Overall (All Time): #2,371,097 of 4,157,543Top 60%

2 Patents All Time

Issued Patents All Time

Showing 1–2 of 2 patents

Patent #	Title	Co-Inventors	Date
4296973	Segmented hardfaced collar for tool joints	—	1981-10-27
4277869	Stabilizer	—	1981-07-14