Granted Patent
Utility
US 4,752,402 · App. 07/102,806
Settling pond separation using permeable fabric and weighting
Inventor:
Lew T. Gray
Patented Case
View Patent ↗
Granted: Jun 21, 1988
Filed: Sep 22, 1987
Inventor
Lew T. Gray
Assignee (at issue)
Phillips Petroleum Company
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.