Granted Patent
Utility
US 6,146,353 · App. 09/158,733
Smoke extraction device
Inventor:
Robert C. Platt
Patented Case
View Patent ↗
Granted: Nov 14, 2000
Filed: Sep 22, 1998
Inventor
Robert C. Platt
Assignee (at issue)
SHERWOOD SERVICES AG
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.