Granted Patent
Utility
US 6,346,646 · App. 09/463,385
Process for producing methacrolein and methacrylic acid
Inventors:
Seigo Watanabe, Motomu Oh-Kita
Patented Case
View Patent ↗
Granted: Feb 12, 2002
Filed: Jan 27, 2000
Inventors
Seigo Watanabe
Motomu Oh-Kita
Assignee (at issue)
MITSUBISHI ELECTRIC CORPORATION
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.