Granted Patent
Utility
US 5,651,933 · App. 08/438,279
Method for making multi-layer preform used for plastic blow molding
Inventors:
William A. Slat, Richard C. Darr
Patented Case
View Patent ↗
Granted: Jul 29, 1997
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.