Patent US2742452A successfully refreshed from Google Patents.
US2742452A
Expired / Lapsed
US
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Process of carrying out the polycondensation of glycol esters of terephthalic acid
Assignee: Glanzstoff AG
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Filing: 1954-08-02
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Granted: 1956-04-17
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Expires: 1974-08-02
Abstract
No abstract record available.
Inventors
- 👤 Heisenberg Erwin
- 👤 Siggel Erhard
- 👤 Watzl Anton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 06:57
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/78; C08G63/81
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
44 words
PROCESS OF POLYCONDENSING GLYCOL ESTERS OF TEREPHTHALIC ACID WHICH COMPRISES HEATING THE ESTERS TO POLYCONDENSATION TEMPERATURE AFTER DISPERSION THEREOF IN PARAFFIN HYDROCARBONS HAVING MELTING POINTS ABOUT 300* C. WHILE PASSING THROUGH SAID DISPERSION VAPORS OF THE GROUP CONSISTING OF INERT AROMATIC AND HYDRO-AROMATIC HYDROCARBONS.
Claim 2
Dependent Claim
44 words
PROCESS OF POLYCONDENSING GLYCOL ESTERS OF TEREPHTHALIC ACID WHICH COMPRISES HEATING THE ESTERS TO POLYCONDENSATION TEMPERATURE AFTER DISPERSION THEREOF IN PARAFFIN HYDROCARBONS HAVING MELTING POINTS ABOUT 300* C. WHILE PASSING THROUGH SAID DISPERSION VAPORS OF THE GROUP CONSISTING OF INERT AROMATIC AND HYDRO-AROMATIC HYDROCARBONS.
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) | 1959-04-17 | 1959-10-17 | 1960-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-04-17 | 1963-10-17 | 1964-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-04-17 | 1967-10-17 | 1968-04-17 | $7700.00 | Window Closed / Lapsed |