Preparation of a semiflexible energy management polyether polyurethane foam using as a crosslinker-surfactant an ethylene oxide adduct of a Mannich condensate prepared from the reaction of nonyl phenol, diethanolamine and formaldehyde

Granted: Feb 1, 1983 Filed: Sep 17, 1981

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.