P

Inventor

JOHNSTON ROBERT F

US5 patents
⚠️ This page may combine multiple inventors who share the name “JOHNSTON ROBERT F”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.

BELL & HOWELL CO

3 patents
US4459475AJul 10, 1984

Automatic calibration for D.C. transducers

BELL & HOWELL CO17 citations71
US4448364AMay 15, 1984

Reversible ribbon drive

BELL & HOWELL CO2 citations60
US4120573AOct 17, 1978

Microfiche reader

BELL & HOWELL CO5 citations60

HENDRICKSON KENNETH L

1 patent
US4032934AJun 28, 1977

Automatic focusing system

HENDRICKSON KENNETH L30 citations74

GALLAGHER JOHN A

1 patent
US3984846AOct 5, 1976

Photoreceptor assembly for automatic focusing system

GALLAGHER JOHN A4 citations51