Issued Patents All Time
Showing 176–200 of 249 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 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 |
| 4806209 | Separation of formic acid from dioxane by extractive distillation | Rudolph J. Szabados | 1989-02-21 |
| 4806319 | Reduction of sulfur and nitrogen oxides using petroleum pitches | — | 1989-02-21 |
| 4801358 | Separation of acetic acid from dioxane by extractive distillation | Rudolph J. Szabados | 1989-01-31 |
| 4801357 | Separation of acetic acid from dioxane by extractive distillation | Rudolph J. Szabados | 1989-01-31 |
| 4793901 | Separation of 2-pentanone from formic acid by extractive distillation | Rudolph J. Szabados | 1988-12-27 |
| 4786370 | Dehydration of formic acid by extractive distillation | — | 1988-11-22 |
| 4756803 | Separation of 2-butanol from t-amyl alcohol by extractive distillation | — | 1988-07-12 |
| 4738755 | Separation of m-xylene from o-xylene by extractive distillation | An-I Yeh | 1988-04-19 |
| 4735690 | Dehydration of impure formic acid by extractive distillation | An-I Yeh | 1988-04-05 |
| 4732653 | Separation of ethanol from t-butanol by extractive distillation | Mark G. Vosburgh | 1988-03-22 |
| 4729818 | Dehydration of acetic acid by extractive distillation | — | 1988-03-08 |
| 4724049 | Separation of isobutyl acetate from isobutanol by extractive distillation | An-I Yeh | 1988-02-09 |
| 4718987 | Separation of isopropanol from isopropyl acetate by extractive distillation | Mark G. Vosburgh | 1988-01-12 |
| 4718988 | Separation of 2-butyl acetate from 2-butanol by extractive distillation | An-I Yeh | 1988-01-12 |
| 4718989 | Separation of isopropanol from isopropyl acetate by extractive distillation | Mark G. Vosburgh | 1988-01-12 |
| 4715933 | Separation of n-propanol from 2-butanol by extractive distillation | Mark G. Vosburgh | 1987-12-29 |
| 4710275 | Separation of isopropanol from t-butanol by extractive distillation | Mark G. Vosburgh | 1987-12-01 |
| 4710274 | Separation of ethanol from isopropanol by extractive distillation | Mark G. Vosburgh | 1987-12-01 |
| 4698137 | Separation of isopropyl acetate from isopropanol by extractive distillation | — | 1987-10-06 |
| 4695350 | Separation of n-hexyl acetate from n-hexyl alcohol by extractive distillation | — | 1987-09-22 |
| 4693789 | Separation of isopropyl acetate from isopropanol by extractive distillation | An-I Yeh | 1987-09-15 |