Granted Patent
Utility
US 4,740,159 · App. 07/074,877
Method for making a dental impression
Inventors:
James Hamilton, Duncan E. Waller, Christina Semkow
Patented Case
View Patent ↗
Granted: Apr 26, 1988
Filed: Jul 17, 1987
Inventors
James Hamilton
Duncan E. Waller
Christina Semkow
Assignee (at issue)
Kerr Manufacturing 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.