Issued Patents All Time
Showing 151–175 of 249 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4975158 | Recovery of glycerine from polyols by azeotropic distillation | — | 1990-12-04 |
| 4975157 | Separation of lactate esters by extractive distillation | — | 1990-12-04 |
| 4969977 | Separation of 2-methyl-butanol-1 from pentanol-1 by extractive distillation | — | 1990-11-13 |
| 4966658 | Recovery of ethylene glycol from butanediol isomers by azeotropic distillation | — | 1990-10-30 |
| 4966656 | Separation of styrene from ethyl benzene or o-xylene by azeotropic or extractive distillation with esters | — | 1990-10-30 |
| 4959128 | Separation of styrene from ethyl benzene by extractive distillation | — | 1990-09-25 |
| 4957595 | Separation of 3-methyl-2-butanone from formic acid by extractive distillation with sulfolane | George Bentu | 1990-09-18 |
| 4948471 | Separation of 4-methyl-2-pentanone from formic or acetic acid by extractive distillation with sulfolane | George Bentu | 1990-08-14 |
| 4948469 | Separation of formic acid from dioxane by extractive distillation with amides | Richard R. Rall | 1990-08-14 |
| 4935102 | Separation of 2,3-butanediol from propylene glycol by azeotropic distillation | — | 1990-06-19 |
| 4935100 | Dehydration of formic acid by extractive distillation | Kraig M. Wendt, Rudolph J. Szabados | 1990-06-19 |
| 4935579 | Separation of m-diisopropylbenzene from p-diisopropylbenzene by azeotropic distillation with alcohols | — | 1990-06-19 |
| 4935103 | Separation of n-propanol from t-amyl alcohol by extractive distillation | Robert W. Christensen, III | 1990-06-19 |
| 4931145 | Separation of benzene from acetone by azeotropic distillation | — | 1990-06-05 |
| 4925533 | Separation of vinyl acetate from ethyl acetate by extractive distillation with acids or acid amides | — | 1990-05-15 |
| 4909907 | Separation of formic acid from acetic acid by extractive distillation with acetyl salicylic acid | — | 1990-03-20 |
| 4904346 | Separation of m-diisopropyl benzene from p-diisopropyl benzene by extractive distillation | — | 1990-02-27 |
| 4897161 | Separation of vinyl acetate from ethyl acetate by extractive distillation | Marc W. Paffhausen | 1990-01-30 |
| 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 |