Granted Patent
Utility
US 6,579,656 · App. 09/896,690
Half esters of isobutylene/maleic anhydride copolymer as attenuators of photographic film development
Inventors:
Agota F. Fehervari, William L. Grimm
Patented Case
View Patent ↗
Granted: Jun 17, 2003
Filed: Jun 29, 2001
Inventors
Agota F. Fehervari
William L. Grimm
Assignee (at issue)
Polaroid Corporation
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.