Granted Patent
Utility
US 4,530,898 · App. 06/584,724
Photographic products and processes providing a negative image
Inventor:
Arnold Spiegal
Patented Case
View Patent ↗
Granted: Jul 23, 1985
Filed: Feb 29, 1984
Inventor
Arnold Spiegal
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.