Granted Patent
Utility
US 6,298,504 · App. 09/404,616
Lockable two frame convertible sofa bed
Inventor:
Robert Fireman
Patented Case
View Patent ↗
Granted: Oct 9, 2001
Filed: Sep 23, 1999
Inventor
Robert Fireman
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.