Granted Patent
Utility
US 4,215,641 · App. 06/055,135
Electronic control of needle thread in a sewing machine
Inventors:
Leo Dobrjanskyj, Donald R. Simon
Patented Case
View Patent ↗
Granted: Aug 5, 1980
Filed: Jul 5, 1979
Inventors
Leo Dobrjanskyj
Donald R. Simon
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.