Granted Patent
Utility
US 4,428,423 · App. 06/375,782
Well screen end fitting assembly and method of making same
Inventors:
Raymond A. Koehler, Bernard M. Hanson
Patented Case
View Patent ↗
Granted: Jan 31, 1984
Filed: May 6, 1982
Inventors
Raymond A. Koehler
Bernard M. Hanson
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.