Granted Patent
Utility
US 5,622,600 · App. 08/477,273
Dyed particulate or granular materials from recycled paper and process for making the materials
Inventors:
Kim Smith, Edward G. Knapick, Brent Willemsen, Ernest P. Wolfer
Patented Case
View Patent ↗
Granted: Apr 22, 1997
Filed: Jun 7, 1995
Inventors
Kim Smith
Edward G. Knapick
Brent Willemsen
Ernest P. Wolfer
Assignee (at issue)
Marcal Paper Mills, 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.