Granted Patent
Utility
US 5,755,892 · App. 08/783,770
Waste disposal of contaminated drill cuttings from geological drilling using drilling fluid systems containing mineral oil
Inventors:
Claus-Peter Herold, Heinz Mueller, Stephan von Tapavizca, Malcolm Ellice, Douglas J. Grimes
Patented Case
View Patent ↗
Granted: May 26, 1998
Filed: Jan 15, 1997
Inventors
Claus-Peter Herold
Heinz Mueller
Stephan von Tapavizca
Malcolm Ellice
Douglas J. Grimes
Assignees (at issue)
Henkel Kommanditgesellschaft auf Aktien
Baroid Limited
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.