IP Library › Granted Patent US 4,942,982
Granted Patent Utility
US 4,942,982 · App. 07/149,338

Silo cleaning apparatus

Inventors: Wesley D. Hartwigsen, Alan D. Johnson, Jeffrey C. Beckham, Kenneth L. White
Patented Case View Patent ↗
Granted: Jul 24, 1990 Filed: Jan 28, 1988
Inventors
Wesley D. Hartwigsen
Alan D. Johnson
Jeffrey C. Beckham
Kenneth L. White

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 4,942,982
App. No.
07/149,338
Filed
1988-01-28
Granted
1990-07-24
Kind
A