Granted Patent
Utility
US 5,226,939 · App. 07/780,768
Surgical smoke evacuation system
Inventors:
Ed F. Nicolas, Ian M. Williamson
Patented Case
View Patent ↗
Granted: Jul 13, 1993
Filed: Oct 22, 1991
Inventors
Ed F. Nicolas
Ian M. Williamson
Assignee (at issue)
Stackhouse, 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.