Granted Patent
Utility
US 4,333,308 · App. 06/200,552
False-twist system switchable between S-twist and Z-twist
Inventors:
Herbert Schleyer, Theo Bieber
Patented Case
View Patent ↗
Granted: Jun 8, 1982
Filed: Oct 24, 1980
Inventors
Herbert Schleyer
Theo Bieber
Assignee (at issue)
Fag Kugelfischer Georg Shäfer AG
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.