Granted Patent
Utility
US 4,522,135 · App. 06/578,449
Looper and cam assembly for chain stitch sewing machine
Inventor:
Stanley J. Ketterer
Patented Case
View Patent ↗
Granted: Jun 11, 1985
Filed: Feb 9, 1984
Inventor
Stanley J. Ketterer
Assignee (at issue)
The Singer Company Limited
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.