Granted Patent
Utility
US 6,554,086 · App. 09/698,481
Obstacle traversing wheelchair
Inventors:
Gerold Goertzen, William A. Null
Patented Case
View Patent ↗
Granted: Apr 29, 2003
Filed: Oct 27, 2000
Inventors
Gerold Goertzen
William A. Null
Assignee (at issue)
INVACARE CORPORATION
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.