Granted Patent
Utility
US 4,972,604 · App. 07/265,253
Method and apparatus for regulating drying kiln air flow
Inventor:
Leon Breckenridge
Patented Case
View Patent ↗
Granted: Nov 27, 1990
Filed: Oct 31, 1988
Inventor
Leon Breckenridge
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.