IP Library › Granted Patent US 4,333,972
Granted Patent Utility
US 4,333,972 · App. 06/162,679

Highly anisotropic membranes

Inventor: Robert E. Kesting
Patented Case View Patent ↗
Granted: Jun 8, 1982 Filed: Jun 25, 1980
Inventor
Robert E. Kesting
Assignee (at issue)
Puropore, 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 4,333,972
App. No.
06/162,679
Filed
1980-06-25
Granted
1982-06-08
Kind
A