IP Library › Granted Patent US 4,477,991
Granted Patent Utility
US 4,477,991 · App. 06/334,087

Frame for transparency film

Inventors: Nolan A. Drevitch, Lawrence E. Green
Patented Case View Patent ↗
Granted: Oct 23, 1984 Filed: Dec 24, 1981
Inventors
Nolan A. Drevitch
Lawrence E. Green
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.

Order Certified Copies
Most orders are placed with the USPTO same day — all within 24 business hours.
Order via The Patent Place →
Pre-filled with this patent's details
Quick Facts
Patent No.
US 4,477,991
App. No.
06/334,087
Filed
1981-12-24
Granted
1984-10-23
Kind
A