Granted Patent
Utility
US 4,805,348 · App. 06/891,241
Flat lapping machine
Inventors:
Hatsuyuki Arai, Isao Nagahashi, Seiichi Maeda, Kazumi Yasuda, Shiro Furusawa, Kazuhiko Hirata, Kastunori Nagao, Kazuhiko Kondo, Takaya Sanoki, Misuo Sugiyama, Shinichi Kusano
Patented Case
View Patent ↗
Granted: Feb 21, 1989
Filed: Jul 29, 1986
Inventors
Hatsuyuki Arai
Isao Nagahashi
Seiichi Maeda
Kazumi Yasuda
Shiro Furusawa
Kazuhiko Hirata
Kastunori Nagao
Kazuhiko Kondo
Takaya Sanoki
Misuo Sugiyama
Shinichi Kusano
Assignee (at issue)
SPEEDFAM CO., LTD.
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.