Granted Patent
Utility
US 6,571,425 · App. 09/824,603
Method of linkage and locking of connecting coupling member to nozzle base of a vacuum cleaner
Inventors:
Robert Vystrcil, Ruskan Iskaliev, Craig Barbeck
Patented Case
View Patent ↗
Granted: Jun 3, 2003
Filed: Apr 2, 2001
Inventors
Robert Vystrcil
Ruskan Iskaliev
Craig Barbeck
Assignee (at issue)
Royal Appliance Mfg., Co.
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.