Granted Patent
Utility
US 5,306,757 · App. 07/994,521
Emulsified alkenylsuccinic acid sizing agent
Inventors:
Shigeto Hatanaka, Yoshio Takahashi, Hideto Umekawa
Patented Case
View Patent ↗
Granted: Apr 26, 1994
Filed: Dec 21, 1992
Inventors
Shigeto Hatanaka
Yoshio Takahashi
Hideto Umekawa
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.