Granted Patent
Utility
US 4,887,619 · App. 07/083,396
Method and apparatus for treating particulate material
Inventors:
Walter E. Burcham, Jr., Wilbur J. French, Jr.
Patented Case
View Patent ↗
Granted: Dec 19, 1989
Filed: Aug 10, 1987
Inventors
Walter E. Burcham, Jr.
Wilbur J. French, Jr.
Assignee (at issue)
R.J. Reynolds Tobacco 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.