Granted Patent
Utility
US 4,252,297 · App. 06/028,862
Transporter lifter
Inventor:
C. Daniel Swain
Patented Case
View Patent ↗
Granted: Feb 24, 1981
Filed: Apr 10, 1979
Inventor
C. Daniel Swain
Assignee (at issue)
Comerco, 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.