Granted Patent
Utility
US 4,576,522 · App. 06/653,803
Rupturable closure
Inventor:
Tommie A. Freeman
Patented Case
View Patent ↗
Granted: Mar 18, 1986
Filed: Sep 21, 1984
Inventor
Tommie A. Freeman
Assignee (at issue)
Halliburton
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.