Inventor

HOPKINSON DEREK

US3 patents

Patents

3 patents

US4838306AJun 13, 1989

Pneumatic locking valve with manual override

ALADDIN ENG & MFG103 citations93

US5081904AJan 21, 1992

Locking valve and flow control valve assembly

ALADDIN ENG & MFG45 citations89

US4838532AJun 13, 1989

Fluid operated clamping device including fluid pressure locking means

ALADDIN ENG & MFG10 citations71