Granted Patent
Utility
US 6,519,991 · App. 10/128,252
Water jet peening apparatus
Inventors:
Katsuhiko Hirano, Kunio Enomoto, Eisaku Hayashi, Sadato Shimizu, Ren Morinaka, Tetsuya Ishikawa, Shigeru Tanaka, Noboru Chiba
Patented Case
View Patent ↗
Granted: Feb 18, 2003
Filed: Apr 24, 2002
Inventors
Katsuhiko Hirano
Kunio Enomoto
Eisaku Hayashi
Sadato Shimizu
Ren Morinaka
Tetsuya Ishikawa
Shigeru Tanaka
Noboru Chiba
Assignees (at issue)
HITACHI, LTD.
Hitachi Kiso Co., Ltd.
Hitachi Ibaraki Business Engineering Co., Ltd.
Hitachi Engineering 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.