Granted Patent
Utility
US 4,677,994 · App. 06/832,554
Process for treating, drying and expanding tobacco
Inventors:
Robert F. Denier, Robert H. Marshall, John N. Jewell, Elmer F. Litzinger
Patented Case
View Patent ↗
Granted: Jul 7, 1987
Filed: Feb 24, 1986
Inventors
Robert F. Denier
Robert H. Marshall
John N. Jewell
Elmer F. Litzinger
Assignee (at issue)
Brown & Williamson Tobacco Corporation
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.