Granted Patent
Utility
US 5,688,121 · App. 08/547,028
Corrugated saliva ejector
Inventor:
Ralph L. Davis
Patented Case
View Patent ↗
Granted: Nov 18, 1997
Filed: Oct 23, 1995
Inventor
Ralph L. Davis
Assignee (at issue)
Filtertek 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.