Granted Patent
Utility
US 4,571,122 · App. 06/655,528
Pipe laying apparatus
Inventors:
Hiroshi Yamamoto, Shuichi Satoh, Yoshiyuki Iwai, Osamu Ae, Masao Suda, Minoru Shiozaki, Kiyoshi Tsuchiya, Manabu Nakano, Kojiro Ogata, Naoki Miyanagi, Kozo Ono, Nobuyuki Tobita
Patented Case
View Patent ↗
Granted: Feb 18, 1986
Filed: Sep 28, 1984
Inventors
Hiroshi Yamamoto
Shuichi Satoh
Yoshiyuki Iwai
Osamu Ae
Masao Suda
Minoru Shiozaki
Kiyoshi Tsuchiya
Manabu Nakano
Kojiro Ogata
Naoki Miyanagi
Kozo Ono
Nobuyuki Tobita
Assignees (at issue)
Nippon Telegraph and Telephone Public Corporation
HITACHI CONSTRUCTION MACHINERY 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.