Granted Patent
Utility
US 5,078,873 · App. 07/503,453
Filter cleaning apparatus
Inventors:
Brent C. Black, Steven G. Coombs, John B. Ainsworth, John Thorum
Patented Case
View Patent ↗
Granted: Jan 7, 1992
Filed: Apr 2, 1990
Inventors
Brent C. Black
Steven G. Coombs
John B. Ainsworth
John Thorum
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.