IP Library › Granted Patent US 5,230,933
Granted Patent Utility
US 5,230,933 · App. 07/551,225

Acid resistant peelable casing

Inventors: Patrick Burns APFELD, Frederick M. Merritt, II
Patented Case View Patent ↗
Granted: Jul 27, 1993 Filed: Jul 11, 1990
Inventors
Patrick Burns APFELD
Frederick M. Merritt, II
Assignee (at issue)
Viskase Companies, 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.

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 5,230,933
App. No.
07/551,225
Filed
1990-07-11
Granted
1993-07-27
Kind
A