Membership
Tour
Register
Log in
Walter O. Zipf III
Follow
Person
Columbus, OH, US
People
Overview
Industries
Organizations
People
Information
Impact
Patents Grants
last 30 patents
Information
Patent Grant
High security door locking device
Patent number
4,909,053
Issue date
Mar 20, 1990
Liberty Telephone Communications, Inc.
Walter O. Zipf
E05 - LOCKS KEYS WINDOW OR DOOR FITTINGS SAFES