Granted Patent
Utility
US 6,557,642 · App. 09/795,922
Submersible pumps
Inventor:
Philip Head
Patented Case
View Patent ↗
Granted: May 6, 2003
Filed: Feb 28, 2001
Inventor
Philip Head
Assignees (at issue)
XL Technology Limited
TSL Technology
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.