Granted Patent
Utility
US 4,814,379 · App. 07/179,597
Toughened, low permeability, solvent and salt resistant polyamide blends
Inventors:
Paul W. Flood, John E. Corn, Robert J. Schafer
Patented Case
View Patent ↗
Granted: Mar 21, 1989
Filed: Apr 11, 1988
Inventors
Paul W. Flood
John E. Corn
Robert J. Schafer
Assignee (at issue)
Ashland Oil, Inc.
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.