Granted Patent
Utility
US 5,300,255 · App. 07/070,676
Surfactant products of poly(hydroxyalkanecarboxylic acid) phosphate esters
Inventors:
Frederick Campbell, John D. Schofield, Alan S. Baker
Patented Case
View Patent ↗
Granted: Apr 5, 1994
Filed: Jul 6, 1987
Inventors
Frederick Campbell
John D. Schofield
Alan S. Baker
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.