Granted Patent
Utility
US 4,420,044 · App. 06/409,511
Flow control system
Inventors:
William H. Pullin, Olen R. Long
Patented Case
View Patent ↗
Granted: Dec 13, 1983
Filed: Aug 19, 1982
Inventors
William H. Pullin
Olen R. Long
Assignee (at issue)
Otis Engineering Corporation
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.