Granted Patent
Utility
US 5,437,331 · App. 08/295,269
Method for fracturing subterranean formations using controlled release breakers and compositions useful therein
Inventors:
D. V. Satyanarayana Gupta, Bethicia B. Prasek
Patented Case
View Patent ↗
Granted: Aug 1, 1995
Filed: Aug 24, 1994
Inventors
D. V. Satyanarayana Gupta
Bethicia B. Prasek
Assignee (at issue)
Western Company of North America
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.