Granted Patent
Utility
US 5,991,972 · App. 09/020,433
Height adjustment mechanism for a cleaning tool
Inventors:
Alan J. Krebs, Craig Cummins
Patented Case
View Patent ↗
Granted: Nov 30, 1999
Filed: Feb 9, 1998
Inventors
Alan J. Krebs
Craig Cummins
Assignee (at issue)
REXAIR 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.