Granted Patent
Utility
US 5,238,844 · App. 07/666,800
Sludge digester
Inventors:
Jeffrey L. Wight, Lynn W. Cook
Patented Case
View Patent ↗
Granted: Aug 24, 1993
Filed: Mar 8, 1991
Inventors
Jeffrey L. Wight
Lynn W. Cook
Assignee (at issue)
Baker Hughes Holdings LLC
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.