Granted Patent
Utility
US 5,904,974 · App. 08/882,151
PVA-base thermoplastic copolymer and its production process and use
Inventors:
Kazuyuki Hanada, Katsumi Kuriyama
Patented Case
View Patent ↗
Granted: May 18, 1999
Filed: Jun 25, 1997
Inventors
Kazuyuki Hanada
Katsumi Kuriyama
Assignees (at issue)
DAINICHISEIKA COLOR & CHEMICALS MFG CO., LTD.
Ukima Colour & Chemicals Mfg. 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.