Granted Patent
Utility
US 4,538,787 · App. 06/488,347
Rigid-foam plastic mold and method of preparation
Inventors:
Richard B. Fox, James B. Sullivan
Patented Case
View Patent ↗
Granted: Sep 3, 1985
Filed: Apr 25, 1983
Inventors
Richard B. Fox
James B. Sullivan
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.