IP Library › Granted Patent US 4,356,271
Granted Patent Utility
US 4,356,271 · App. 06/254,926

Noncollapsible ceramic foam

Inventors: Thomas Francis, John E. Marhanka, Raymond P. Heilich
Patented Case View Patent ↗
Granted: Oct 26, 1982 Filed: Apr 16, 1981
Inventors
Thomas Francis
John E. Marhanka
Raymond P. Heilich
Assignee (at issue)
Aluminum Company of America

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 4,356,271
App. No.
06/254,926
Filed
1981-04-16
Granted
1982-10-26
Kind
A