Granted Patent
Utility
US 6,018,985 · App. 09/019,713
Method and apparatus for measuring unattached radon progeny
Inventor:
Derek R. Lane-Smith
Patented Case
View Patent ↗
Granted: Feb 1, 2000
Filed: Feb 6, 1998
Inventor
Derek R. Lane-Smith
Assignee (at issue)
Durridge 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.