Inventor

AHRENS ROBERT H

US4 patents

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

SCHWAAB INC

2 patents

USD266257SSep 21, 1982

Hand operated ink stamp

SCHWAAB INC18 citations78

US4362101ADec 7, 1982

Variable impression hand stamp

SCHWAAB INC18 citations70

AUTOTROL CORP

1 patent

US4772386ASep 20, 1988

Filter with liquid meter

AUTOTROL CORP65 citations91

BERGSTROM MFG CO

1 patent

US4718453AJan 12, 1988

Rotary valve

BERGSTROM MFG CO8 citations68