Granted Patent
Utility
US 5,639,812 · App. 08/542,906
Alkenylsuccinic acid emulsion sizing agent (1)
Inventors:
Yasusuke Takeda, Sadao Kotsuka, Takeshi Kouchi
Patented Case
View Patent ↗
Granted: Jun 17, 1997
Filed: Oct 13, 1995
Inventors
Yasusuke Takeda
Sadao Kotsuka
Takeshi Kouchi
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.