Granted Patent
Utility
US 4,533,578 · App. 06/527,933
Sandwich foam coextrusion for high performance polyolefin trash bags
Inventors:
Dana M. Boyd, Edward A. Colombo, William H. Lashway
Patented Case
View Patent ↗
Granted: Aug 6, 1985
Filed: Aug 30, 1983
Inventors
Dana M. Boyd
Edward A. Colombo
William H. Lashway
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.