Granted Patent
Utility
US 6,435,224 · App. 09/921,452
Automatic refill system for ultra pure or contamination sensitive chemicals
Inventors:
Christopher S. Blatt, Richard H. Pearce, Graham Williams, Edward H. Wentworth, III
Patented Case
View Patent ↗
Granted: Aug 20, 2002
Filed: Aug 2, 2001
Inventors
Christopher S. Blatt
Richard H. Pearce
Graham Williams
Edward H. Wentworth, III
Assignee (at issue)
Arch Specialty Chemicals, Inc.
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.