Granted Patent
Utility
US 5,226,479 · App. 07/818,526
Fracturing fluid having a delayed enzyme breaker
Inventors:
D. V. Satyanarayana Gupta, Marek K. Pakulski, Bethicia M. Prasek
Patented Case
View Patent ↗
Granted: Jul 13, 1993
Filed: Jan 9, 1992
Inventors
D. V. Satyanarayana Gupta
Marek K. Pakulski
Bethicia M. 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.