Granted Patent
Utility
US 4,461,647 · App. 06/401,713
Fluidizing agent
Inventors:
John D. Schofield, Arne Vinther
Patented Case
View Patent ↗
Granted: Jul 24, 1984
Filed: Jul 26, 1982
Inventors
John D. Schofield
Arne Vinther
Assignee (at issue)
IMPERIAL CHEMICAL INDUSTRIES LIMITED
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.