Granted Patent
Utility
US 5,647,793 · App. 08/687,603
Apparatus and method for preventing sudden changes of pressure in vehicles
Inventors:
Gilles Mariaux, Yves Gervais
Patented Case
View Patent ↗
Granted: Jul 15, 1997
Filed: Aug 8, 1996
Inventors
Gilles Mariaux
Yves Gervais
Assignee (at issue)
GEC Alsthom Transport SA
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.