Granted Patent
Utility
US 4,125,159 · App. 05/843,152
Method and apparatus for isolating and treating subsurface stratas
Inventor:
Roy R. Vann
Patented Case
View Patent ↗
Granted: Nov 14, 1978
Filed: Oct 17, 1977
Inventor
Roy R. Vann
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.