Issued Patents All Time
Showing 126–150 of 249 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5147512 | Separation of ketone isomers by extractive distillation | Thomas Edison | 1992-09-15 |
| 5131985 | Separation of chloroform from a lower alcohol by extractive distillation | Zuyin Yang | 1992-07-21 |
| 5125932 | Dissolution of coal with petroleum pitch | John C. Orth | 1992-06-30 |
| 5124005 | Separation of methylene chloride from ethyl vinyl ether by extractive distillation | Zuyin Yang | 1992-06-23 |
| 5118392 | Separation of trichloroethylene from a butyl alcohol by extractive distillation | — | 1992-06-02 |
| 5106459 | Separation of p-menthane from p-cymene by extractive distillation | — | 1992-04-21 |
| 5106460 | Separation of 1,1,1-trichloroethane from N-hexane by extractive distillation | — | 1992-04-21 |
| 5100514 | Separation of pyridine from water by extractive distillation | Zuyin Yang | 1992-03-31 |
| 5094724 | Separation of methylene chloride from the lower formates by extractive distillation | Zuyin Yang | 1992-03-10 |
| 5094723 | Separation of m-xylene from p-xylene or o-xylene by extractive distillation with alcohols | — | 1992-03-10 |
| 5094725 | Separation of m-xylene from o-xylene by extractive distillation with esters | — | 1992-03-10 |
| 5092966 | Separation of methylene chloride from ethyl ether by extractive distillation | Zuyin Yang | 1992-03-03 |
| 5092965 | Separation of 4-methyl-2-pentanone from acetic acid by extractive distillation with DMFA | Marc W. Paffhausen | 1992-03-03 |
| 5091059 | Separation of p-xylene from m-xylene by extractive distillation | — | 1992-02-25 |
| 5085739 | Separation of the propyl alcohols from water by azeotropic or extractive distillation | Zuyin Yang | 1992-02-04 |
| 5084142 | Separation of tertiary butyl alcohol from water by azeotropic or extractive distillation | Zuyin Yang | 1992-01-28 |
| 5069756 | Separation of cyclohexane from cyclohexene by azeotropic or extractive distillation | — | 1991-12-03 |
| 5051153 | Separation of methylene chloride from methylal by extractive distillation | — | 1991-09-24 |
| 5039380 | Separation of m-xylene from p-xylene or o-xylene by azeotropic distillation | — | 1991-08-13 |
| 5019217 | Separation of m-xylene from o-xylene by extractive distillation using esters | George Bentu | 1991-05-28 |
| 5006205 | Dehydration of formic acid by extractive distillation | Kraig M. Wendt, Rudolph J. Szabados | 1991-04-09 |
| 4996333 | Conversion of acetic acid into diketene and water using dimethylsulfoxide and pelargonic acid | — | 1991-02-26 |
| 4994151 | Separation of 4-methyl-2-pentanone from formic acid by extractive distillation with dimethylamides | George Bentu | 1991-02-19 |
| 4981667 | Removal of sulfur from petroleum coke with lime | John Berg | 1991-01-01 |
| 4980033 | Recovery of triethylene glycol from triols by azeotropic distillation | — | 1990-12-25 |