IP Library › Granted Patent US 4,834,216
Granted Patent Utility
US 4,834,216 · App. 07/003,613

Foldable ladder structure and method of manufacturing the same

Inventors: Claude R. Wallick, Jr., Thomas J. Schmitt
Patented Case View Patent ↗
Granted: May 30, 1989 Filed: Jan 15, 1987
Inventors
Claude R. Wallick, Jr.
Thomas J. Schmitt
Assignee (at issue)
Emerson Electric 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 4,834,216
App. No.
07/003,613
Filed
1987-01-15
Granted
1989-05-30
Kind
A