Issued Patents All Time
Showing 51–75 of 77 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4736030 | Preparation of 1-alkyl- or 1-cycloalkylpiperazines | Dieter Voges, Wolfgang Lengsfeld | 1988-04-05 |
| 4728722 | Preparation of polyoxybutylene polyoxyalkylene glycols having a narrow molecular weight distribution and a reduced content of oligomeric cyclic ethers | — | 1988-03-01 |
| 4715841 | Balloon holder | David C. Nelson, Michael J. Fresh | 1987-12-29 |
| 4670519 | Narrowing the molecular weight distribution of polytetrahydrofuran | — | 1987-06-02 |
| 4654243 | Device for guiding daylight | Julius Moench, Heinz Rentzsch, Georg Lang | 1987-03-31 |
| 4638097 | Reducing the content of cyclic oligomeric ethers in polytetramethylene ether glycols or polyoxybutylene polyoxyalkylene glycols | — | 1987-01-20 |
| 4608422 | Preparation of hydroxyl-containing polymers | — | 1986-08-26 |
| 4599466 | Preparation of alkanediols | Wolfgang Reiss | 1986-07-08 |
| 4588827 | Preparation of tetrahydrofuran | Christof Palm | 1986-05-13 |
| 4585592 | Reducing the content of oligomeric cyclic ethers in polyoxybutylene polyoxyalkylene glycols | — | 1986-04-29 |
| 4567303 | Process and apparatus for preparing or reacting alkanolamines | Guenter Boettger, Hans Hammer, Otto Hertel, Gerhard Jeschek, Emil Scharf +1 more | 1986-01-28 |
| 4564671 | Continuous preparation of polyoxybutylene polyoxyalkylene glycols | — | 1986-01-14 |
| 4539415 | Preparation of 3-hydroxytetrahydrofuran | Dieter Voges | 1985-09-03 |
| 4480124 | Process for the purifying of polytetramethylene ether glycol or corresponding diester | — | 1984-10-30 |
| 4464526 | Preparation of polycaprolactone | — | 1984-08-07 |
| 4460796 | Purification of polytetramethylene ether-glycols | — | 1984-07-17 |
| 4442306 | Production of tertiary amines | Hartmut Axel, Arnold Wittwer | 1984-04-10 |
| 4363924 | Depolymerization of polytetramethylene glycol ethers | Otto H. Huchler | 1982-12-14 |
| 4277422 | Vulcanization activator | Gerhard Paulus, Hubert Schoeppl, Emil Scharf | 1981-07-07 |
| 4259531 | Polymerization of tetrahydrofuran to prepare polytetramethylene ether glycols | Otto H. Huchler, Walter Mesch, Siegfried Winderl, Herwig Hoffmann | 1981-03-31 |
| 4243799 | Polymerization of tetrahydrofuran | Otto H. Huchler, Herwig Hoffmann | 1981-01-06 |
| 4233228 | Purification of tetrahydrofuran | Otto H. Huchler | 1980-11-11 |
| 4224251 | Preparation of 5-diethylaminopentan-2-ol | Herbert Toussaint, Arnold Wittwer | 1980-09-23 |
| 4207263 | Manufacture of secondary amines by alkylating ammonia with alcohols | Herwig Hoffmann, Herbert Toussaint, Arnold Wittwer | 1980-06-10 |
| 4203908 | Manufacture of cyclic ethers | Otto H. Huchler | 1980-05-20 |