Granted Patent
Utility
US 5,407,080 · App. 08/070,599
Apatite flotation reagent
Inventors:
William E. Welch, John C. Miller
Patented Case
View Patent ↗
Granted: Apr 18, 1995
Filed: Jun 1, 1993
Inventors
William E. Welch
John C. Miller
Assignee (at issue)
Tomah Products, Inc.
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.