Granted Patent
Utility
US 6,505,532 · App. 09/907,869
Universal drain tool
Inventor:
Thomas Lawson
Patented Case
View Patent ↗
Granted: Jan 14, 2003
Filed: Jul 18, 2001
Inventor
Thomas Lawson
Assignee (at issue)
Lawson Industries
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.