Granted Patent
Utility
US 6,638,622 · App. 09/759,117
Perfluorinated polyethers with metal carboxylate end groups as anti-wetting and corrosion-protective agents
Inventors:
Qing Dai, Paul Haruo Kasai, Wing Tsang Tang
Patented Case
View Patent ↗
Granted: Oct 28, 2003
Filed: Jan 11, 2001
Inventors
Qing Dai
Paul Haruo Kasai
Wing Tsang Tang
Assignee (at issue)
Hitachi Global Storage Technologies Japan, Ltd.
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.