Granted Patent
Utility
US 5,892,148 · App. 08/843,782
Method of leak testing an underground fluid-storage cavity
Inventors:
Jean-Gerard Durup, Benoit Guerber, Pierre Berest, Benoit Brouard, Jean Bergues
Patented Case
View Patent ↗
Granted: Apr 6, 1999
Filed: Apr 21, 1997
Inventors
Jean-Gerard Durup
Benoit Guerber
Pierre Berest
Benoit Brouard
Jean Bergues
Assignee (at issue)
Gaz de France
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.