Granted Patent
Utility
US 5,046,437 · App. 07/454,582
Device in a button sewing machine for maintaining looseness in needle thread while preventing the thread from being pulled out of the sewing needle
Inventors:
Katsuo Hiratsuka, Imao Yazaki, Koichi Nakayama, Masanori Ayuta
Patented Case
View Patent ↗
Granted: Sep 10, 1991
Filed: Dec 15, 1989
Inventors
Katsuo Hiratsuka
Imao Yazaki
Koichi Nakayama
Masanori Ayuta
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.