IP Library Granted Patent US 4,748,743
Granted Patent Utility
US 4,748,743 · App. 07/002,561

Utility knife with improved blade locking feature

Inventors: Lloyd E. Anderson, Martin L. Anderson
Patented Case View Patent ↗
Granted: Jun 7, 1988 Filed: Jan 12, 1987
Inventors
Lloyd E. Anderson
Martin L. Anderson

This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.

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Quick Facts
Patent No.
US 4,748,743
App. No.
07/002,561
Filed
1987-01-12
Granted
1988-06-07
Kind
A