Granted Patent
Utility
US 5,216,926 · App. 07/924,636
Closed and open tube sampling apparatus
Inventor:
James H. Lipscomb
Patented Case
View Patent ↗
Granted: Jun 8, 1993
Filed: Aug 5, 1992
Inventor
James H. Lipscomb
Assignee (at issue)
E.I. DU PONT DE NEMOURS AND 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.