Issued Patents All Time
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5214178 | Cyclic acylphosphinic acid derivatives and process for their preparation | — | 1993-05-25 |
| 5214179 | Cyclic acylphosphinic acid derivatives and process for their preparation | — | 1993-05-25 |
| 5196554 | Aluminum bis(hydroxymethyl)phosphinate, and a process for the preparation of bis(hydroxymethyl)phosphinates | — | 1993-03-23 |
| 5003108 | Process for the preparation of phosphanes | Othmar Stelzer, Klaus-Peter Langhans, Norbert Weferling | 1991-03-26 |
| 4975254 | Process for removing hydrogen phosphide from waste air | Ursus Thummler | 1990-12-04 |
| 4885394 | Process for the preparation of tertiary phosphine oxides | Norbert Weferling | 1989-12-05 |