Granted Patent
Utility
US 6,135,022 · App. 09/150,453
Lightweight marking device
Inventor:
Thomas Troester
Patented Case
View Patent ↗
Granted: Oct 24, 2000
Filed: Sep 9, 1998
Inventor
Thomas Troester
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.