Granted Patent
Utility
US 4,892,589 · App. 07/232,820
Composition comprising water-soluble, nonionic hydrophobically modified hydroxyethyl cellulose and water-soluble, nonionic hydroxyethyl cellulose
Inventors:
William J. Kirkland, Carl A. Lukach, William C. McLachlan
Patented Case
View Patent ↗
Granted: Jan 9, 1990
Filed: Aug 16, 1988
Inventors
William J. Kirkland
Carl A. Lukach
William C. McLachlan
Assignee (at issue)
Aqualon 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.