Granted Patent
Utility
US 5,456,022 · App. 08/256,638
Batch-type sludge drier
Inventors:
David P. McLeod, David J. Spyker, Daniel De Haan, Greg De Haan, Wesley G. Koops, James E. Roelofs
Patented Case
View Patent ↗
Granted: Oct 10, 1995
Filed: Jul 13, 1994
Inventors
David P. McLeod
David J. Spyker
Daniel De Haan
Greg De Haan
Wesley G. Koops
James E. Roelofs
Assignee (at issue)
JWI Ltd.
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.