Granted Patent
Utility
US 6,676,473 · App. 09/968,959
Smart smoke unit
Inventors:
Martin Pierson, James M. Rohde
Patented Case
View Patent ↗
Granted: Jan 13, 2004
Filed: Oct 1, 2001
Inventors
Martin Pierson
James M. Rohde
Assignee (at issue)
Lionel LLC
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.