US2809208A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of dialkyl esters of isophthalic and terephthalic acids from nitriles
Assignee: Honeywell International Inc
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Filing: 1954-12-13
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Granted: 1957-10-08
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Expires: 1974-12-13
Abstract
No abstract record available.
Inventors
- 👤 Robert E Miller
- 👤 Rosenthal Rudolph
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 11:43
CPC Classifications
C; C07; C07C; C07C69/00; C07C69/76; C07C69/80; C07C69/82
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
68 words
A PROCESS FOR PREPARING DIALKYL PHTHALATES WHICH COMPRISES REACTING A MEMER OF THE GROUP CONSISTING OF TEREPHTHALONITRILE,ISOPHTHALONITRILE AND MIXTURES THEREOF WITH AN EXCESS OF SULFURIC ACID AND EXCESS OF WATER AT A TEMPERATURE OF ABOUT 30 TO 80* C., THEREBY FORMING A REACTION MASS COMPRISING THE CORRESPONDING PHTHALAMIDE, AND REACTING SAID REACTION MASS WITH AN EXCESS OF AN ESTERIFYING ALCOHOL AT A TEMPERATURE OF ABOUT 65 TO 200*C.
Claim 2
Dependent Claim
68 words
A PROCESS FOR PREPARING DIALKYL PHTHALATES WHICH COMPRISES REACTING A MEMER OF THE GROUP CONSISTING OF TEREPHTHALONITRILE,ISOPHTHALONITRILE AND MIXTURES THEREOF WITH AN EXCESS OF SULFURIC ACID AND EXCESS OF WATER AT A TEMPERATURE OF ABOUT 30 TO 80* C., THEREBY FORMING A REACTION MASS COMPRISING THE CORRESPONDING PHTHALAMIDE, AND REACTING SAID REACTION MASS WITH AN EXCESS OF AN ESTERIFYING ALCOHOL AT A TEMPERATURE OF ABOUT 65 TO 200*C.
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) | 1960-10-07 | 1961-04-08 | 1961-10-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-10-07 | 1965-04-08 | 1965-10-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-10-07 | 1969-04-08 | 1969-10-08 | $7700.00 | Window Closed / Lapsed |