Granted Patent
Utility
US 4,432,078 · App. 06/226,891
Method and apparatus for fracturing a deep borehole and determining the fracture azimuth
Inventor:
Daniel Silverman
Patented Case
View Patent ↗
Granted: Feb 14, 1984
Filed: Jan 21, 1981
Inventor
Daniel Silverman
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.