Patent comparison

Compare Patents

Compare two patents side by side. Add ?a=us/7657849&b=us/8046721 to the URL to load specific patents.

US 2046343

The Invention of the Phillips Head Screw

A 1936 patent for a cross-shaped screw head designed to keep a screwdriver centered and prevent it from slipping during high-speed assembly.

Statusexpired

Granted1936

Expires1954

Claims0

Forward citations8

Prior art0

AssigneePhillips Screw Co

InventorsHenry F Phillips

Patent B

Add ?b=us/7657849 to compare

How to use

Bookmark a comparison URL to save it. Format: /compare?a=[country]/[number]&b=[country]/[number]. Example: /compare?a=us/7657849&b=us/8046721