Granted Patent
Utility
US 6,380,445 · App. 09/567,348
Poly(9,9'-spirobisfluorenes), their production and their use
Inventors:
Ralf-Roman Rietz, Wolfgang Wernet
Patented Case
View Patent ↗
Granted: Apr 30, 2002
Filed: May 9, 2000
Inventors
Ralf-Roman Rietz
Wolfgang Wernet
Assignee (at issue)
Vantico Inc.
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.