IP Library › Granted Patent US 4,567,993
Granted Patent Utility
US 4,567,993 · App. 06/628,651

Tamper-evident closure

Inventors: Leman P. Albrecht, W. Cox Willis
Patented Case View Patent ↗
Granted: Feb 4, 1986 Filed: Jul 6, 1984
Inventors
Leman P. Albrecht
W. Cox Willis
Assignee (at issue)
Aluminum Company of America

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.

Order Certified Copies
Most orders are placed with the USPTO same day — all within 24 business hours.
Order via The Patent Place →
Pre-filled with this patent's details
Quick Facts
Patent No.
US 4,567,993
App. No.
06/628,651
Filed
1984-07-06
Granted
1986-02-04
Kind
A