Granted Patent
Utility
US 5,431,972 · App. 08/142,260
Nucleation of crystallization in polyesters
Inventors:
Donald E. Richeson, William G. Perkins, Walter Francis Johnston
Patented Case
View Patent ↗
Granted: Jul 11, 1995
Filed: Oct 22, 1993
Inventors
Donald E. Richeson
William G. Perkins
Walter Francis Johnston
Assignee (at issue)
SHELL OIL COMPANY
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.