Granted Patent
Utility
US 5,804,305 · App. 08/438,515
Multi-layer preform used for plastic blow molding
Inventors:
William A. Slat, Richard C. Darr
Patented Case
View Patent ↗
Granted: Sep 8, 1998
Filed: May 10, 1995
Inventors
William A. Slat
Richard C. Darr
Assignee (at issue)
Plastipak Packaging, Inc.
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.