Granted Patent
Utility
US 6,109,312 · App. 09/263,326
Air evacuation insert for wood chip digester
Inventors:
Michael Sawyer, Thomas Morrow
Patented Case
View Patent ↗
Granted: Aug 29, 2000
Filed: Mar 5, 1999
Inventors
Michael Sawyer
Thomas Morrow
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.