Granted Patent
Utility
US 4,271,900 · App. 05/920,122
Apparatus with expandable tube bundle
Inventor:
Charles F. Reitz
Patented Case
View Patent ↗
Granted: Jun 9, 1981
Filed: Jun 28, 1978
Inventor
Charles F. Reitz
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.