Otto J. Friedrich

Follow

Person

Dusseldorf, DE

People

Patents Grantslast 30 patents

Information Patent Grant
Method for the preparation of a fine-grained mixture having hydroph...
- Patent number 5,114,475
- Issue date May 19, 1992
- Mannesmann Aktiengesellschaft
- Werner Siegmund
- E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES