Granted Patent
Utility
US 4,795,581 · App. 07/036,650
Aqueous fluids thickened with fatty acid modified polyoxyalkylene diamines
Inventors:
Edward C. Y. Nieh, Jiang-Jen Lin, George P. Speranza
Patented Case
View Patent ↗
Granted: Jan 3, 1989
Filed: Apr 10, 1987
Inventors
Edward C. Y. Nieh
Jiang-Jen Lin
George P. Speranza
Assignee (at issue)
Texaco Inc.
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.