Granted Patent
Utility
US 5,028,658 · App. 07/408,831
Sheet of polyvinyl butyral and polyurethane
Inventors:
Donald J. David, Thomas F. Sincock
Patented Case
View Patent ↗
Granted: Jul 2, 1991
Filed: Sep 18, 1989
Inventors
Donald J. David
Thomas F. Sincock
Assignee (at issue)
Monsanto Company
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.