Granted Patent
Utility
US 5,219,912 · App. 07/727,727
Emulsified alkenylsuccinic acid sizing agent
Inventors:
Yoshio Takahashi, Junji Okazaki, Hideto Umekawa, Toshihiro Tahara
Patented Case
View Patent ↗
Granted: Jun 15, 1993
Filed: Jul 10, 1991
Inventors
Yoshio Takahashi
Junji Okazaki
Hideto Umekawa
Toshihiro Tahara
Assignee (at issue)
Mitsubishi Oil 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.