Granted Patent
Utility
US 4,819,829 · App. 07/182,257
Closure for pourable materials container
Inventors:
David B. Rosten, William C. Perchak, Douglas E. Foos, Richard L. Partlow, Jr., Gary G. Buhrke
Patented Case
View Patent ↗
Granted: Apr 11, 1989
Filed: Apr 15, 1988
Inventors
David B. Rosten
William C. Perchak
Douglas E. Foos
Richard L. Partlow, Jr.
Gary G. Buhrke
Assignee (at issue)
Plastofilm Industries, 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.