Granted Patent
Utility
US 6,239,089 · App. 09/439,985
Aqueous cleaning solutions containing elevated levels of N-alkyl-2-pyrrolidone
Inventors:
Francis R. Cala, Jennifer Lynn Kester
Patented Case
View Patent ↗
Granted: May 29, 2001
Filed: Nov 12, 1999
Inventors
Francis R. Cala
Jennifer Lynn Kester
Assignee (at issue)
Church & Dwight Co., 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.