Granted Patent
Utility
US 6,716,799 · App. 09/308,400
Use of selected fatty alcohols and their mixtures with carboxylic acid esters as lubricant components in water-based drilling fluid systems for soil exploration
Inventors:
Heinz Mueller, Claus-Peter Herold, Stephan von Tapavicza
Patented Case
View Patent ↗
Granted: Apr 6, 2004
Filed: Jun 1, 1999
Inventors
Heinz Mueller
Claus-Peter Herold
Stephan von Tapavicza
Assignee (at issue)
Cognis Deutschland GmbH & Co. KG
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.