Granted Patent
Utility
US 5,011,499 · App. 07/332,535
Tanning agent formulation for manufacture of semifinished leather products
Inventors:
Paul Rathfelder, Jozef Sagala, Friedrich Landbeck, Heinz Matschkal
Patented Case
View Patent ↗
Granted: Apr 30, 1991
Filed: Apr 3, 1989
Inventors
Paul Rathfelder
Jozef Sagala
Friedrich Landbeck
Heinz Matschkal
Assignee (at issue)
SCHILL + SEILACHER GMBH
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.