Granted Patent
Utility
US 6,537,584 · App. 09/710,403
Polymer blends that swell in an acidic environment and deswell in a basic environment
Inventors:
Gaylen M. Zentner, Jong-Seok Bark, Feng Liu
Patented Case
View Patent ↗
Granted: Mar 25, 2003
Filed: Nov 9, 2000
Inventors
Gaylen M. Zentner
Jong-Seok Bark
Feng Liu
Assignee (at issue)
Macromed, 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.