Boring
Welcome | What’s New?
Site Map | Usage Note

Become a Contributor
Really Boring
What is a Leadholder?
Leadholder History
Leadholder Mechanics
Leadholder Database
Yawn
References
Contributors
Leadholder Links
Contact D. B. Smith

United States Patent 3,097,628 “Mechanical Pencil” 1960–1963

date of application
date granted
inventor
assignee
patent holder country
1960 July 7
1963 July 16
Frank J. Stoeberl
Dur-O-Lite Pencil Company
United States
patent employed on
Dur-O-Lite Keen-Point Drafting Pencil