Granted Patent
Utility
US 4,647,385 · App. 06/796,965
Reduction of viscosity of aqueous fluids
Inventors:
Martin M. Williams, Martha A. Phelps, George M. Zody
Patented Case
View Patent ↗
Granted: Mar 3, 1987
Filed: Nov 12, 1985
Inventors
Martin M. Williams
Martha A. Phelps
George M. Zody
Assignee (at issue)
Hi-Tek Polymers, 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.