Granted Patent
Utility
US 5,167,828 · App. 07/772,174
Phosphinate-containing polymers for controlling scale in underground petroleum-containing formations and equipment associated therewith
Inventors:
Daniel H. Emmons, Dodd W. Fong, Mary A. Kinsella
Patented Case
View Patent ↗
Granted: Dec 1, 1992
Filed: Oct 7, 1991
Inventors
Daniel H. Emmons
Dodd W. Fong
Mary A. Kinsella
Assignee (at issue)
Nalco Chemical 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.