Granted Patent
Utility
US 5,984,773 · App. 08/898,247
Method and apparatus for regulating the internal pressure of a ventilated, closed space subjected to variations in external pressure
Inventors:
Yves Gervais, Gilles Mariaux, Gerard Mineaud, Alain Guinot, Pierre A. Andre
Patented Case
View Patent ↗
Granted: Nov 16, 1999
Filed: Jul 22, 1997
Inventors
Yves Gervais
Gilles Mariaux
Gerard Mineaud
Alain Guinot
Pierre A. Andre
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.