Granted Patent
Utility
US 4,432,426 · App. 06/255,927
Stair climbing wheelchair carrier
Inventor:
Rintaro Misawa
Patented Case
View Patent ↗
Granted: Feb 21, 1984
Filed: Apr 20, 1981
Inventor
Rintaro Misawa
Assignee (at issue)
Sunwa Sharyo Manufacturing Co., Ltd.
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.