Granted Patent
Utility
US 4,370,919 · App. 06/229,392
Vent cap assembly for a monitoring well
Inventors:
Walter R. Wagner, Richard Duda
Patented Case
View Patent ↗
Granted: Feb 1, 1983
Filed: Jan 29, 1981
Inventors
Walter R. Wagner
Richard Duda
Assignee (at issue)
UOP LLC
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.