Granted Patent
Utility
US 4,400,426 · App. 06/317,762
Thermal insulation material comprising a mixture of silk and synthetic fiber staple
Inventor:
William Aldrich
Patented Case
View Patent ↗
Granted: Aug 23, 1983
Filed: Nov 3, 1981
Inventor
William Aldrich
Assignee (at issue)
Warnaco 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.