Granted Patent
Utility
US 6,664,365 · App. 09/366,046
Process for producing poly(alkylene oxide) in the presence of a phosphazenium salt or compound
Inventors:
Tadahito Nobori, Masahiro Kouno, Toshiaki Suzuki, Kazumi Mizutani, Shinji Kiyono, Yoshiho Sonobe, Usaji Takaki
Patented Case
View Patent ↗
Granted: Dec 16, 2003
Filed: Sep 3, 1999
Inventors
Tadahito Nobori
Masahiro Kouno
Toshiaki Suzuki
Kazumi Mizutani
Shinji Kiyono
Yoshiho Sonobe
Usaji Takaki
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.