Granted Patent
Utility
US 4,967,678 · App. 07/364,398
Speed controller for controlling revolution speed of upper shaft of cycle sewing machine
Inventors:
Katsuo Hiratsuka, Masanori Ayuta, Koichi Nakayama, Imao Yazaki
Patented Case
View Patent ↗
Granted: Nov 6, 1990
Filed: Jun 12, 1989
Inventors
Katsuo Hiratsuka
Masanori Ayuta
Koichi Nakayama
Imao Yazaki
Assignee (at issue)
SSMC 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.