Granted Patent
Utility
US 6,353,049 · App. 09/367,346
Elastic polyurethane fiber and process for producing the same
Inventors:
Masanori Doi, Akihiko Yoshizato
Patented Case
View Patent ↗
Granted: Mar 5, 2002
Filed: Aug 12, 1999
Inventors
Masanori Doi
Akihiko Yoshizato
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.