Inventor

BETTGER RICHARD R

US3 patents

Patents

3 patents

US4884835ADec 5, 1989

Lever spindle spring cage

SCHLAGE LOCK CO16 citations71

US4875352AOct 24, 1989

Construction keying

SCHLAGE LOCK CO18 citations71

US4648643AMar 10, 1987

Retrofit lever assembly for a door knob

SCHLAGE LOCK CO15 citations68