Granted Patent
Utility
US 6,221,561 · App. 09/369,831
Diffusion plate and method for manufacturing master die thereof
Inventors:
Hiroshi Kuboya, Toshiharu Takahashi, Makoto Iki, Moriyasu Shirayanagi, Koichi Maruyama, Teruaki Hiyamuta, Takayuki Sensui
Patented Case
View Patent ↗
Granted: Apr 24, 2001
Filed: Aug 9, 1999
Inventors
Hiroshi Kuboya
Toshiharu Takahashi
Makoto Iki
Moriyasu Shirayanagi
Koichi Maruyama
Teruaki Hiyamuta
Takayuki Sensui
Assignee (at issue)
Asahi Kogaku Kogyo Kabushiki Kaisha
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.