Granted Patent
Utility
US 5,044,290 · App. 07/440,839
Wiper unit of a sewing machine
Inventors:
Shuichi Sato, Shirou Ayusawa
Patented Case
View Patent ↗
Granted: Sep 3, 1991
Filed: Nov 24, 1989
Inventors
Shuichi Sato
Shirou Ayusawa
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.