Patent US2798087A successfully refreshed from Google Patents.
US2798087A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of monoester terephthalamates
Assignee: California Research LLC
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Filing: 1954-06-28
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Granted: 1957-07-02
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Expires: 1974-06-28
Abstract
No abstract record available.
Inventors
- 👤 Bruce W Hotten
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 07:32
CPC Classifications
C; C07; C07C; C07C233/00; C07C233/01; C07C233/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
122 words
THE PROCESS OF PREPARING MONOESTERS OF TEREPHTHALAMIC ACID COMPRISING FORMING A SOLUTION OF A TEREPHTHALIC ACID DERIVATIVE AND A PRIMARY AMINE IN A TERIARY AMINE, HEATING SAID ADMIXTURE TO A TEMPERATURE SUFFICIENT TO FORM A HOMOGENEOUS SOLUTION, FOLLOWED BY COOLING OF SAID SOLUTION TO A TEMPERATURE BELOW THE BOILING POINT OF PHOSPHORUS CHLORIDE, ADDING PHOSPHORUS CHLORIDE IN AN AMOUNT FROM 0.25 MOLE TO 4 MOLES PER MOLE OF SAID TEREPHTHALIC ACID DERIVATIVE, HEATING THE RESULTING MIXTURE TO A TEMPERATURE RANGING FROM 100*C. TO ABOUT 200*C., AFTER WHICH THE MIXTURE IS COOLED AND THE DESIRED MONOESTER OF TEREPHTHALAMIC ACID IS RECOVERED, SAID TEREPHTHALIC ACID DERIVATIVE BEING SELECTED FROM THE GROUP CONSISTING OF MONOESTERS OF TEREPHTHALIC ACID AND SALTS OF MONOESTERS OF TEREPHTHALIC ACID.
Claim 2
Dependent Claim
122 words
THE PROCESS OF PREPARING MONOESTERS OF TEREPHTHALAMIC ACID COMPRISING FORMING A SOLUTION OF A TEREPHTHALIC ACID DERIVATIVE AND A PRIMARY AMINE IN A TERIARY AMINE, HEATING SAID ADMIXTURE TO A TEMPERATURE SUFFICIENT TO FORM A HOMOGENEOUS SOLUTION, FOLLOWED BY COOLING OF SAID SOLUTION TO A TEMPERATURE BELOW THE BOILING POINT OF PHOSPHORUS CHLORIDE, ADDING PHOSPHORUS CHLORIDE IN AN AMOUNT FROM 0.25 MOLE TO 4 MOLES PER MOLE OF SAID TEREPHTHALIC ACID DERIVATIVE, HEATING THE RESULTING MIXTURE TO A TEMPERATURE RANGING FROM 100*C. TO ABOUT 200*C., AFTER WHICH THE MIXTURE IS COOLED AND THE DESIRED MONOESTER OF TEREPHTHALAMIC ACID IS RECOVERED, SAID TEREPHTHALIC ACID DERIVATIVE BEING SELECTED FROM THE GROUP CONSISTING OF MONOESTERS OF TEREPHTHALIC ACID AND SALTS OF MONOESTERS OF TEREPHTHALIC ACID.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-07-01 | 1960-12-31 | 1961-07-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-07-01 | 1964-12-31 | 1965-07-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-07-01 | 1968-12-31 | 1969-07-02 | $7700.00 | Window Closed / Lapsed |