Patent JPS5458378A successfully refreshed from Google Patents.
US2806052A
Expired / Lapsed
US
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Process of esterifying dicarboxylic acids having high boiling points or decomposition points with mono-or poly-hydric alcohols
Assignee: Glanzstoff AG
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Filing: 1953-04-20
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Granted: 1957-09-10
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Expires: 1973-04-20
Abstract
No abstract record available.
Inventors
- 👤 Siggel Erhard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 10:17
CPC Classifications
C; C07; C07C; C07C67/00; C07C67/08; C07C69/00; C07C69/34; C07C69/76; C07C69/80; C07C69/82
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
65 words
METHOD OF MANUFACTURING ESTERS OF TERPHTHALIC ACID WHICH COMPRISES REACTING TEREPHTHALIC ACID IN THE GRANULAR STATE WITH AN ALCOHOL IN THE VAJOR STATE AT A TEMPERATURE OF FROM ABOUT 100* TO 310*C., THEREBY TO PRODUCE THE ESTER IS THE VAPOR STATE, AND MOVING THE ESTER IN THE VAPOR STATE FROM THE ZONE OF FORMATION INTO A ZONE OF LOWER TEMPERATURE WHEREIN THE ESTER UNDERGOES CONDENSATION.
Claim 2
Dependent Claim
65 words
METHOD OF MANUFACTURING ESTERS OF TERPHTHALIC ACID WHICH COMPRISES REACTING TEREPHTHALIC ACID IN THE GRANULAR STATE WITH AN ALCOHOL IN THE VAJOR STATE AT A TEMPERATURE OF FROM ABOUT 100* TO 310*C., THEREBY TO PRODUCE THE ESTER IS THE VAPOR STATE, AND MOVING THE ESTER IN THE VAPOR STATE FROM THE ZONE OF FORMATION INTO A ZONE OF LOWER TEMPERATURE WHEREIN THE ESTER UNDERGOES CONDENSATION.
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) | 1960-09-09 | 1961-03-11 | 1961-09-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-09-09 | 1965-03-11 | 1965-09-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-09-09 | 1969-03-11 | 1969-09-10 | $7700.00 | Window Closed / Lapsed |