Inventor

SCHUMACHER JR PERCY W

US4 patents

⚠️ This page may combine multiple inventors who share the name “SCHUMACHER JR PERCY W”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.

REED ROCK BIT CO

2 patents

US4444281AApr 24, 1984

Combination drag and roller cutter drill bit

REED ROCK BIT CO118 citations95

US4611673ASep 16, 1986

Drill bit having offset roller cutters and improved nozzles

REED ROCK BIT CO89 citations94

REED TOOL CO

2 patents

US4446935AMay 8, 1984

Intermittent high-drag oil well drilling bit

REED TOOL CO23 citations79

US3971600AJul 27, 1976

Drill bit

REED TOOL CO18 citations71