Knofel; Hartmut
Patent Applications and Registrations
Patent applications and USPTO patent grants for Knofel; Hartmut.The latest application filed is for "fractionation and purification of aromatic polyamine mixtures and the use thereof".
- Knofel; Hartmut - Odenthal DE
- Knofel; Hartmut - Leverkusen DT
| Patent | Date |
|---|---|
| Fractionation and purification of aromatic polyamine mixtures and the use thereof Grant 5,684,180 - Knofel , et al. November 4, 1 | 1997-11-04 |
| Dissocyanates, diisocyanate mixtures and a process for their production Grant 4,786,751 - Knofel , et al. November 22, 1 | 1988-11-22 |
| Triisocyanates and a process for their preparation Grant 4,603,189 - Knofel , et al. July 29, 1 | 1986-07-29 |
| Process for the preparation of mixtures of polyamines of the polyamino-polyaryl-polymethylene type Grant 4,259,526 - Dunlap , et al. March 31, 1 | 1981-03-31 |
| Process for the preparation of polyamines Grant 4,094,907 - Knofel , et al. June 13, 1 | 1978-06-13 |
| Process for the preparation of aromatic polyamines Grant 4,093,658 - Knofel , et al. June 6, 1 | 1978-06-06 |
uspto.report is an independent third-party trademark research tool that is not affiliated, endorsed, or sponsored by the United States Patent and Trademark Office (USPTO) or any other governmental organization. The information provided by uspto.report is based on publicly available data at the time of writing and is intended for informational purposes only.
While we strive to provide accurate and up-to-date information, we do not guarantee the accuracy, completeness, reliability, or suitability of the information displayed on this site. The use of this site is at your own risk. Any reliance you place on such information is therefore strictly at your own risk.
All official trademark data, including owner information, should be verified by visiting the official USPTO website at www.uspto.gov. This site is not intended to replace professional legal advice and should not be used as a substitute for consulting with a legal professional who is knowledgeable about trademark law.
| 