Granted Patent
Utility
US 4,003,985 · App. 05/653,876
Production of sodium sulfite
Inventors:
Robert Joel Hoffman, Samuel L. Bean, Philip F. Seeling, James W. Swaine, Jr.
Patented Case
View Patent ↗
Granted: Jan 18, 1977
Filed: Jan 30, 1976
Inventors
Robert Joel Hoffman
Samuel L. Bean
Philip F. Seeling
James W. Swaine, Jr.
Assignee (at issue)
Allied Chemical 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.