US2760972A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making phthalate esters
Assignee: Lyndhurst Chemical Corp
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Filing: 1951-05-29
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Granted: 1956-08-28
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Expires: 1971-05-29
Abstract
No abstract record available.
Inventors
- 👤 Joy Homer Van Beuren
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 11:12
CPC Classifications
C; C07; C07C; C07C69/00; C07C69/76; C07C69/80; C08; C08K; C08K5/00; C08K5/04; C08K5/09; C08K5/098; C08K5/10; C08K5/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
99 words
THE METHOD OF MAKING A COMPOSITION CONTAINING AN ORTHOPHTHALIC ESTER OF METHYL ISOBUTYL CARBINOL WHICH COMPRISES HEATING AT FROM 140 TO 170* C. WHILE CONTINUOUSLY REMOVING WATER FROM THE REACTION ZONE, A PHTHALIC REACTANT SELECTED FROM THE GROUP CONSISTING OF ORTHO PHTHALIC ACID AND PHTHALIC ANHYDRIDE WITH METHYL ISOBUTYL CARBINOL IN AMOUNT TO ESTERIFY AT LEAST 0.8 OF THE CARBOXYL GROUPS OF TE PHTHALIC REACTANT IN THE PRESENCE OF A CATALYTIC AMOUNT OF A SULFONIC ACID SELECTED FROM THE GROUP CONSISTING OF ALIPHATIC AND AROMATIC SULFONIC ACIDS AT A TEMPERATURE BELOW THAT OF FORMATION OF OLEFINES IN SUBSTANTIAL AMOUNT.
Claim 2
Independent Claim
99 words
THE METHOD OF MAKING A COMPOSITION CONTAINING AN ORTHOPHTHALIC ESTER OF METHYL ISOBUTYL CARBINOL WHICH COMPRISES HEATING AT FROM 140 TO 170* C. WHILE CONTINUOUSLY REMOVING WATER FROM THE REACTION ZONE, A PHTHALIC REACTANT SELECTED FROM THE GROUP CONSISTING OF ORTHO PHTHALIC ACID AND PHTHALIC ANHYDRIDE WITH METHYL ISOBUTYL CARBINOL IN AMOUNT TO ESTERIFY AT LEAST 0.8 OF THE CARBOXYL GROUPS OF TE PHTHALIC REACTANT IN THE PRESENCE OF A CATALYTIC AMOUNT OF A SULFONIC ACID SELECTED FROM THE GROUP CONSISTING OF ALIPHATIC AND AROMATIC SULFONIC ACIDS AT A TEMPERATURE BELOW THAT OF FORMATION OF OLEFINES IN SUBSTANTIAL AMOUNT.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-08-28 | 1960-02-27 | 1960-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-08-28 | 1964-02-27 | 1964-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-08-28 | 1968-02-27 | 1968-08-28 | $7700.00 | Window Closed / Lapsed |