Granted Patent
Utility
US 5,252,571 · App. 07/813,182
1,4-benzothiazine-2-acetic acid derivatives
Inventors:
Tomoji Aotsuka, Hiroshi Hosono, Toshio Kurihara, Yoshiyuki Nakamura, Tetsuo Matsui, Fujio Kobayashi
Patented Case
View Patent ↗
Granted: Oct 12, 1993
Filed: Dec 24, 1991
Inventors
Tomoji Aotsuka
Hiroshi Hosono
Toshio Kurihara
Yoshiyuki Nakamura
Tetsuo Matsui
Fujio Kobayashi
Assignee (at issue)
Sapporo Breweries Limited
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.