Granted Patent
Utility
US 5,146,922 · App. 07/678,943
Volumetric measurement of a body cavity of a patient
Inventors:
Ian Williamson, David H. Kerridge
Patented Case
View Patent ↗
Granted: Sep 15, 1992
Filed: Apr 15, 1991
Inventors
Ian Williamson
David H. Kerridge
Assignee (at issue)
NATIONAL RESEARCH DEVELOPMENT 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.