Issued Patents 1989
Showing 1–15 of 15 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4880505 | Separation of M-diisopropylbenzene from P-diisopropylbenzene by azeotropic distillation with esters | — | 1989-11-14 |
| 4877491 | Separation of m-diisopropyl benzene from p-diisopropyl benzene by azeotropic distillation with ketones | — | 1989-10-31 |
| 4877490 | Dehydration of formic acid by extractive distillation with dicarboxylic acids | Kraig M. Wendt, Rudolph J. Szabados | 1989-10-31 |
| 4861436 | Recovery of 4-methyl-2-pentanone from acetic acid by distillation | Richard R. Rall, Marc W. Paffhausen | 1989-08-29 |
| 4859285 | Separation of 2-pentanone from formic acid by extractive distillation | Rudolph J. Szabados, Thomas H. Flower | 1989-08-22 |
| 4855531 | Separation of m-diisopropylbenzene from p-diisoporopylbenzene by azeotropic distillation with ethers | — | 1989-08-08 |
| 4851087 | Separation of m-diisopropylbenzene from p-diisopropyl benzene by azeotropic distillation with nitrogenous compounds | — | 1989-07-25 |
| 4840707 | Separation of 3-methyl-2-butanone from formic acid by extractive distillation | Richard R. Rall | 1989-06-20 |
| 4836896 | Separation of m-diisopropylbenzene from p-diisoproylbenzene by azeotropic distillation with acetophenone | — | 1989-06-06 |
| 4826576 | Separation of isopropyl acetate from isopropanol by extractive distillation | An-I Yeh | 1989-05-02 |
| 4822947 | Separation of m-xylene from o-xylene by extractive distillation with DMSO | An-I Yeh | 1989-04-18 |
| 4806319 | Reduction of sulfur and nitrogen oxides using petroleum pitches | — | 1989-02-21 |
| 4806209 | Separation of formic acid from dioxane by extractive distillation | Rudolph J. Szabados | 1989-02-21 |
| 4801357 | Separation of acetic acid from dioxane by extractive distillation | Rudolph J. Szabados | 1989-01-31 |
| 4801358 | Separation of acetic acid from dioxane by extractive distillation | Rudolph J. Szabados | 1989-01-31 |