Granted Patent
Utility
US 6,578,294 · App. 09/776,020
Dredge cutterhead
Inventor:
Charles G. Ollinger, IV
Patented Case
View Patent ↗
Granted: Jun 17, 2003
Filed: Feb 2, 2001
Inventor
Charles G. Ollinger, IV
Assignee (at issue)
ESCO GROUP 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.