Granted Patent
Utility
US 4,428,897 · App. 06/452,777
Process for preparing particle board
Inventors:
Steven B. Lowenkron, Richard A. Prather, Howard R. Steele
Patented Case
View Patent ↗
Granted: Jan 31, 1984
Filed: Dec 23, 1982
Inventors
Steven B. Lowenkron
Richard A. Prather
Howard R. Steele
Assignee (at issue)
The Upjohn Co.
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.