Issued Patents All Time
Showing 1–11 of 11 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6926063 | Method for conditioning foundry moulding sand and a device therefor | Paul Eirich, Walter Eirich | 2005-08-09 |
| 4997357 | Apparatus for treatment of power station residues | Paul Eirich, Walter Eirich, Herbert Durr | 1991-03-05 |
| 4854715 | Pressure-resistant mixer | Paul Eirich, Walter Eirich | 1989-08-08 |
| 4758372 | Method of producing lead paste for batteries | Walter Eirich, Paul Eirich | 1988-07-19 |
| 4744829 | Process for producing agglomerates which are resistant to leaching out | Paul Eirich, Walter Eirich | 1988-05-17 |
| 4681267 | Method of regenerating old casting sand | Dieter S. Leidel, Paul Eirich, Walter Eirich | 1987-07-21 |
| 4624003 | Apparatus for heating electrically conductive bulk materials | Paul Eirich, Walter Eirich, Erwin Goldschmidt | 1986-11-18 |
| 4569025 | Method of preparing foundrys and by measuring moisture and compressibility | Paul Eirich, Walter Eirich | 1986-02-04 |
| 4562970 | Apparatus for opening and closing the outlet aperture of a processing machine | Walter Eirich, Paul Eirich | 1986-01-07 |
| 4560283 | Apparatus for closing and continuously emptying the container of a treatment machine | Paul Eirich, Walter Eirich, Erwin Goldschmidt | 1985-12-24 |
| 4186592 | Method of measuring the moisture content in flowable materials and apparatus for carrying out the method | Walter Eirich, Paul Eirich, Josef Hasenhundl, Adolf Spengler | 1980-02-05 |