Granted Patent
Utility
US 4,257,746 · App. 05/948,037
Dosimeter having a low air flow rate
Inventor:
Adoniram J. Wells
Patented Case
View Patent ↗
Granted: Mar 24, 1981
Filed: Oct 2, 1978
Inventor
Adoniram J. Wells
Assignee (at issue)
E.I. DU PONT DE NEMOURS AND COMPANY
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.