Granted Patent
Utility
US 4,809,447 · App. 07/120,331
Waterproof breathable sock
Inventors:
David J. Pacanowsky, Ruth S. Williams
Patented Case
View Patent ↗
Granted: Mar 7, 1989
Filed: Nov 13, 1987
Inventors
David J. Pacanowsky
Ruth S. Williams
Assignee (at issue)
W. L. Gore & Associates, 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.