Granted Patent
Utility
US 6,540,218 · App. 08/939,293
Sheet feed shaft, apparatus for manufacturing same and method for manufacturing same
Inventors:
Sakae Tsukada, Eiji Tsukada
Patented Case
View Patent ↗
Granted: Apr 1, 2003
Filed: Sep 29, 1997
Inventors
Sakae Tsukada
Eiji Tsukada
Assignee (at issue)
Kabushiki Kaisha Tsukada Nezi Seisakusho
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.