| 5362908 |
Catalyst and method for purifying crude terephthalic acid, isophthalic acid or naphthalene dicarboxylic acid |
Ricky L. Wittman |
1994-11-08 |
| 5354898 |
Method for purifying crude aromatic carboxylic acids |
— |
1994-10-11 |
| 4937378 |
Purification of crude isophthalic acid |
— |
1990-06-26 |
| 4933491 |
Method for purifying a crude naphthalene dicarboxylic acid |
Rusins Albertins, Stephen J. Pietsch, Juergen K. Holzhauer |
1990-06-12 |
| 4933492 |
Purification of crude isophthalic acid |
Ricky L. Wittman |
1990-06-12 |
| 4892972 |
Purification of crude terephthalic acid |
David E. James |
1990-01-09 |
| 4833269 |
Method for purifying terephthalic acid recycle streams |
— |
1989-05-23 |
| 4808751 |
Method for reactivating a group VIII noble metal catalyst for use in the purification of crude terephthalic acid |
Ricky L. Wittman |
1989-02-28 |
| 4743577 |
Catalyst composition |
Ricky L. Wittman |
1988-05-10 |
| 4728630 |
Rhodium on carbon catalyst |
Ricky L. Wittman |
1988-03-01 |
| 4629715 |
Purification of terephthalic acid to relatively low levels of 4-carboxybenzaldehyde and catalyst therefor |
— |
1986-12-16 |
| 4260546 |
Aged molten color of maleic anhydride |
Donald E. Thomka |
1981-04-07 |
| 4234494 |
Formation, purification and recovery of phthalic anhydride |
David Aaron Palmer |
1980-11-18 |
| 4233227 |
Phthalic anhydride formation and separation |
David Aaron Palmer |
1980-11-11 |
| 4220596 |
Separation of phthalic anhydride from vapor mixture also containing water vapor |
Jeffrey H. Schott, David Aaron Palmer |
1980-09-02 |
| 4215053 |
Production of ortho-phthalic acid and its conversion and recovery of phthalic anhydride |
David Aaron Palmer, George E. Kuhlmann, Houssam M. Naim, Nicholas C. Huie |
1980-07-29 |
| 4215054 |
Production of liquid ortho-phthalic acid and its conversion to high purity phthalic anhydride |
George E. Kuhlmann, Sydney G. Horsfield, David Aaron Palmer |
1980-07-29 |
| 4215056 |
Formation, purification and recovery of phthalic anhydride |
David Aaron Palmer |
1980-07-29 |
| 4215055 |
Production of liquid ortho-phthalic acid and its conversion to high _purity phthalic anhdyride |
David Aaron Palmer, George E. Kuhlmann, Sydney G. Horsfield |
1980-07-29 |
| 4215051 |
Formation, purification and recovery of phthalic anhydride |
David Aaron Palmer |
1980-07-29 |
| 4215052 |
Production of liquid ortho-phthalic acid and its conversion to high purity phthalic anhydride |
David Aaron Palmer, George E. Kuhlmann, Houssam M. Naim, Nicholas C. Huie |
1980-07-29 |
| 4197247 |
Removal of bromine from phthalic anhydride |
Delbert H. Meyer |
1980-04-08 |