Granted Patent
Utility
US 4,438,817 · App. 06/426,695
Subsea well with retrievable piping deck
Inventors:
Roger L. Pokladnik, William A. Valka
Patented Case
View Patent ↗
Granted: Mar 27, 1984
Filed: Sep 29, 1982
Inventors
Roger L. Pokladnik
William A. Valka
Assignee (at issue)
Armco Inc.
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.