Granted Patent
Utility
US 4,152,274 · App. 05/876,296
Method for reducing friction loss in a well fracturing process
Inventors:
Kenneth G. Phillips, Wood E. Hunter
Patented Case
View Patent ↗
Granted: May 1, 1979
Filed: Feb 9, 1978
Inventors
Kenneth G. Phillips
Wood E. Hunter
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.