Granted Patent
Utility
US 4,570,819 · App. 06/556,390
Fill means for cryogenic flasks
Inventors:
Warren E. Perkins, Mark T. Novak
Patented Case
View Patent ↗
Granted: Feb 18, 1986
Filed: Nov 30, 1983
Inventors
Warren E. Perkins
Mark T. Novak
Assignee (at issue)
Cryo, 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.