Granted Patent
Utility
US 4,527,494 · App. 06/160,415
Bobbin case position plate adjustment mechanism
Inventors:
William Lee Herron, John D. Speckman
Patented Case
View Patent ↗
Granted: Jul 9, 1985
Filed: Jun 18, 1980
Inventors
William Lee Herron
John D. Speckman
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.