Granted Patent
Utility
US 6,684,573 · App. 09/848,907
Elevator door sill assembly
Inventors:
Ernest Heath, Eugene Ulm
Patented Case
View Patent ↗
Granted: Feb 3, 2004
Filed: May 4, 2001
Inventors
Ernest Heath
Eugene Ulm
Assignee (at issue)
Thyssen Elevator Capital Corp.
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.