Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6468359 | Cleaning method | Bernhard Lehmann | 2002-10-22 |
| 6245157 | Use of polyaspartic acids in cleaner formulations with abrasive action | Bernhard Lehmann, Hartwig Wendt, Herbert Emde, Urban Recht | 2001-06-12 |
| 6231680 | Cleaning method using a mixture containing wood chippings and, optionally, polyaspartic acid and/or a derivative of a polyaspartic acid | Bernhard Lehmann | 2001-05-15 |
| 4667091 | Device for automatically tracking a moving object | — | 1987-05-19 |