IP Library Granted Patent US 4,401,795
Granted Patent Utility
US 4,401,795 · App. 06/223,441

Polymeric polyelectrolytes

Inventors: Daniel F. Herman, Uno Kruse
Patented Case View Patent ↗
Granted: Aug 30, 1983 Filed: Jan 8, 1981
Inventors
Daniel F. Herman
Uno Kruse
Assignee (at issue)
NL Industries, 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 4,401,795
App. No.
06/223,441
Filed
1981-01-08
Granted
1983-08-30
Kind
A