Granted Patent
Utility
US 4,258,529 · App. 06/035,131
Method of sealing a container
Inventor:
Ernest L. Smith
Patented Case
View Patent ↗
Granted: Mar 31, 1981
Filed: May 1, 1979
Inventor
Ernest L. Smith
Assignee (at issue)
Phillips Petroleum Company
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.