Granted Patent
Utility
US 6,464,459 · App. 09/871,597
Lifting platform with energy recovery
Inventor:
Lewis Illingworth
Patented Case
View Patent ↗
Granted: Oct 15, 2002
Filed: May 31, 2001
Inventor
Lewis Illingworth
Assignee (at issue)
Avionic Instruments, Inc.
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.