Granted Patent
Utility
US 4,721,502 · App. 06/904,441
Apparatus for sealing a hem in a moving web of film
Inventor:
Fox J. Herrington
Patented Case
View Patent ↗
Granted: Jan 26, 1988
Filed: Sep 8, 1986
Inventor
Fox J. Herrington
Assignee (at issue)
Mobil Oil Corporation
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.