Granted Patent
Utility
US 6,448,218 · App. 09/142,652
Modified aluminosilicate
Inventors:
Peter Willem Appel, Theodorus Johannes Cornelius Arts, Carolyn Angela Lanceley, Theo Jan Osinga
Patented Case
View Patent ↗
Granted: Sep 10, 2002
Filed: Aug 3, 1999
Inventors
Peter Willem Appel
Theodorus Johannes Cornelius Arts
Carolyn Angela Lanceley
Theo Jan Osinga
Assignee (at issue)
Crosfield Limited
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.