Granted Patent
Utility
US 4,901,980 · App. 07/044,819
Portable car hoist and trailer with removable wheels
Inventor:
N. Larry Hansen
Patented Case
View Patent ↗
Granted: Feb 20, 1990
Filed: Apr 29, 1987
Inventor
N. Larry Hansen
Assignee (at issue)
Johnson Industries, 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.