IP Library › Granted Patent US 4,873,409
Granted Patent Utility
US 4,873,409 · App. 07/113,646

Closed-loop microwave popcorn control

Inventors: Fred T. Spruytenburg, Charles W. McDonald, Michael J. Hodgetts
Patented Case View Patent ↗
Granted: Oct 10, 1989 Filed: Oct 26, 1987
Inventors
Fred T. Spruytenburg
Charles W. McDonald
Michael J. Hodgetts

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 4,873,409
App. No.
07/113,646
Filed
1987-10-26
Granted
1989-10-10
Kind
A