Granted Patent
Utility
US 6,689,461 · App. 10/122,296
False twisted yarn of polyester composite fiber and method for production thereof
Inventors:
Tadashi Koyanagi, Takao Abe, Teruhiko Matsuo, Mitsuyuki Yamamoto
Patented Case
View Patent ↗
Granted: Feb 10, 2004
Filed: Apr 16, 2002
Inventors
Tadashi Koyanagi
Takao Abe
Teruhiko Matsuo
Mitsuyuki Yamamoto
Assignee (at issue)
ASAHI KASEI KABUSHIKI KAISHA
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.