Granted Patent
Utility
US 3,931,072 · App. 05/283,573
Particleboard, hardboard, and plywood produced in combination with a lignin sulfonate-phenol formaldehyde glue system
Inventor:
Robert P. Coyle
Patented Case
View Patent ↗
Granted: Jan 6, 1976
Filed: Aug 24, 1972
Inventor
Robert P. Coyle
Assignee (at issue)
Champion International Corporation Limited
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.