Granted Patent
Utility
US 5,985,939 · App. 08/877,740
Processes for producing aerosol propellants that include butane or isobutane
Inventor:
Barbara Haviland Minor
Patented Case
View Patent ↗
Granted: Nov 16, 1999
Filed: Jun 17, 1997
Inventor
Barbara Haviland Minor
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.