Granted Patent
Utility
US 4,748,307 · App. 06/858,617
Tube furnace
Inventor:
John G. Lamb
Patented Case
View Patent ↗
Granted: May 31, 1988
Filed: May 1, 1986
Inventor
John G. Lamb
Assignee (at issue)
STC PLC
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.