Granted Patent
Utility
US 6,506,039 · App. 09/996,824
Screw compressor
Inventors:
Hiroki Osumimoto, Shigekazu Nozawa, Masayuki Urashin, Takeshi Hida, Hirotaka Kameya, Atsushi Watanabe
Patented Case
View Patent ↗
Granted: Jan 14, 2003
Filed: Nov 30, 2001
Inventors
Hiroki Osumimoto
Shigekazu Nozawa
Masayuki Urashin
Takeshi Hida
Hirotaka Kameya
Atsushi Watanabe
Assignee (at issue)
HITACHI, 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.