米国登録特許

1. Michiko Oba, Norihisa Komoda, Kazuhiro Kawashima, Keiichi Hara, Method for determining optimum schedule in computer-aided scheduling system, US5241465 A, 1992.8.3
2. Kazuhiro Kawashima, Norihisa Komoda, Keiichi Hara, Tetsushi Tomizawa, Kouichi Taniguchi, Michiko Oba, Computer aided planning support system, US5303144 A, 1994.4.12
3. Michiko Oba, Norihisa Komoda, Kazuhiro Kawashima, Computer aided planning method and system, US6047315 A, 1994.4.12
4. Hiroshi Tsuji, Yoji Taniguchi, Hirohide Haga, Satoshi Wakayama, Michiko Oba, Toyozo Aoyama, Shoichi Masui, System for task tracking and controlling electronic mail, US5764898 A, 1998.6.9
5. Hiroshi Tsuji, Yoji Taniguchi, Hirohide Haga, Satoshi Wakayama, Michiko Oba, Toyozo Aoyama, Shoichi Masui, System for task tracking and controlling electronic mail, US6047315 A, 2000.4.4
6. Hiroshi Tsuji, Yoji Taniguchi, Hirohide Haga, Satoshi Wakayama, Michiko Oba, Toyozo Aoyama, Shoichi Masui, System for task tracking and controlling electronic mail, US 6434603 B1, 2001.8.13