Granted Patent
Utility
US 4,190,697 · App. 06/003,374
Multidensity foam article and method of preparation
Inventor:
John Ahrens
Patented Case
View Patent ↗
Granted: Feb 26, 1980
Filed: Jan 15, 1979
Inventor
John Ahrens
Assignee (at issue)
Milsco Manufacturing 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.