Granted Patent
Utility
US 4,784,693 · App. 07/115,214
Cementing composition and aqueous hydraulic cementing solution comprising water-soluble, nonionic hydrophobically modified hydroxyethyl cellulose
Inventors:
William J. Kirkland, Carl A. Lukach, William C. McLachlan
Patented Case
View Patent ↗
Granted: Nov 15, 1988
Filed: Oct 30, 1987
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.