Granted Patent
Utility
US 4,915,871 · App. 07/337,413
Water resistance of fine-vermiculite articles
Inventors:
Alan W. Atkinson, Jody K. Burnett
Patented Case
View Patent ↗
Granted: Apr 10, 1990
Filed: Apr 13, 1989
Inventors
Alan W. Atkinson
Jody K. Burnett
Assignee (at issue)
T&N Technology 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.