Granted Patent
Utility
US 4,326,421 · App. 06/115,094
Continuous proofloader
Inventors:
William D. Pilesi, Harry Trautmann
Patented Case
View Patent ↗
Granted: Apr 27, 1982
Filed: Jan 24, 1980
Inventors
William D. Pilesi
Harry Trautmann
Assignee (at issue)
KOPPERS, 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.