IP Library › Granted Patent US 4,136,508
Granted Patent Utility
US 4,136,508 · App. 05/758,064

Closed-loop combine header height control

Inventors: Martin Coleman, Edwin M. Northup
Patented Case View Patent ↗
Granted: Jan 30, 1979 Filed: Jan 7, 1977
Inventors
Martin Coleman
Edwin M. Northup
Assignee (at issue)
Allis-Chalmers Corporation

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 4,136,508
App. No.
05/758,064
Filed
1977-01-07
Granted
1979-01-30
Kind
A