Granted Patent
Utility
US 4,938,832 · App. 07/358,985
Cardable hydrophobic polypropylene fiber, material and method for preparation thereof
Inventor:
A. Chandler Schmalz
Patented Case
View Patent ↗
Granted: Jul 3, 1990
Filed: May 30, 1989
Inventor
A. Chandler Schmalz
Assignee (at issue)
HERCULES LLC
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.