Granted Patent
Utility
US 4,558,636 · App. 06/605,419
Protective shelter flow control apparatus
Inventors:
Herbert A. Malmstrom, Henry A. Roddiger
Patented Case
View Patent ↗
Granted: Dec 17, 1985
Filed: Apr 30, 1984
Inventors
Herbert A. Malmstrom
Henry A. Roddiger
Assignee (at issue)
Engineered Air Systems
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.