Granted Patent
Utility
US 4,799,964 · App. 07/045,221
Preparation of filler compositions for paper
Inventors:
Richard D. Harvey, Robert E. Klem
Patented Case
View Patent ↗
Granted: Jan 24, 1989
Filed: Apr 29, 1987
Inventors
Richard D. Harvey
Robert E. Klem
Assignee (at issue)
Grain Processing 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.