Granted Patent
Utility
US 4,244,899 · App. 06/014,157
Method for chemical embossing a foamable thermoplastic resin sheet using an ink composition containing a chemical blowing agent
Inventor:
David I. M. Henshaw
Patented Case
View Patent ↗
Granted: Jan 13, 1981
Filed: Feb 22, 1979
Inventor
David I. M. Henshaw
Assignee (at issue)
CONGOLEUM CORPORATION
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.