Granted Patent
Utility
US 6,604,555 · App. 10/211,940
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 12, 2003
Filed: Aug 2, 2002
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.