Granted Patent
Utility
US 6,458,455 · App. 09/934,866
Poly(trimethylene terephthalate) tetrachannel cross-section staple fiber
Inventors:
Ismael A. Hernandez, Geoffrey Hietpas, James M. Howell, Claudia Schultze
Patented Case
View Patent ↗
Granted: Oct 1, 2002
Filed: Aug 22, 2001
Inventors
Ismael A. Hernandez
Geoffrey Hietpas
James M. Howell
Claudia Schultze
Assignee (at issue)
E.I. DU PONT DE NEMOURS AND COMPANY
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.