Granted Patent
Utility
US 4,248,259 · App. 05/797,305
Fluid flow control device
Inventors:
Niilo Kaartinen, Pentti J. Juhala
Patented Case
View Patent ↗
Granted: Feb 3, 1981
Filed: May 16, 1977
Inventors
Niilo Kaartinen
Pentti J. Juhala
Assignee (at issue)
Packard Instrument Company, 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.