Granted Patent
Utility
US 5,190,990 · App. 07/515,827
Device and method for shielding healthy tissue during radiation therapy
Inventor:
Frederick C. Eichmiller
Patented Case
View Patent ↗
Granted: Mar 2, 1993
Filed: Apr 27, 1990
Inventor
Frederick C. Eichmiller
Assignee (at issue)
American Dental Association Health Foundation
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.