IP Library › Granted Patent US 4,567,840
Granted Patent Utility
US 4,567,840 · App. 06/509,365

Closure for a chain entry aperture

Inventors: Edward J. Arlt, L. Blake Whitley
Patented Case View Patent ↗
Granted: Feb 4, 1986 Filed: Jun 30, 1983
Inventors
Edward J. Arlt
L. Blake Whitley
Assignee (at issue)
LTV Energy Products Co.

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 4,567,840
App. No.
06/509,365
Filed
1983-06-30
Granted
1986-02-04
Kind
A