Inventor

SPRING WILLIAM A

US4 patents

Patents

4 patents

US6109851AAug 29, 2000

Screws having selected heat treatment and hardening

ILLINOIS TOOL WORKS59 citations93

US4523883AJun 18, 1985

Printed circuit board fastener

ILLINOIS TOOL WORKS35 citations91

US6364972B1Apr 2, 2002

Method for selectively hardening a carbon steel screw

ILLINOIS TOOL WORKS15 citations89

US4652971AMar 24, 1987

Printed circuit board fastener

ILLINOIS TOOL WORKS20 citations81