Granted Patent
Utility
US 6,624,281 · App. 10/158,616
Polyurethane/ureas useful for the production of spandex and a process for their production
Inventor:
Bruce D. Lawrey
Patented Case
View Patent ↗
Granted: Sep 23, 2003
Filed: May 30, 2002
Inventor
Bruce D. Lawrey
Assignee (at issue)
Bayer Aktiengesellschaft
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.