Granted Patent
Utility
US 4,436,576 · App. 06/255,760
Apparatus for forming bottom heat seals
Inventor:
Frederick C. Seiden
Patented Case
View Patent ↗
Granted: Mar 13, 1984
Filed: Apr 20, 1981
Inventor
Frederick C. Seiden
Assignee (at issue)
Rexham Holdings Limited
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.