Granted Patent
Utility
US 4,470,251 · App. 05/891,611
Knittable yarn and safety apparel made therewith
Inventor:
William H. Bettcher
Patented Case
View Patent ↗
Granted: Sep 11, 1984
Filed: Mar 30, 1978
Inventor
William H. Bettcher
Assignee (at issue)
Bettcher Industries, 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.