US3120561A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of terephthalic acid
Assignee: Rhodiaceta SA
•
Filing: 1958-01-17
•
Granted: 1964-02-04
•
Expires: 1978-01-17
Abstract
No abstract record available.
Inventors
- 👤 Chambret Remy Fernand
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 13:05
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/09
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
39 words
PROCESS FOR THE PRODUCTION OF TEREPHTHALIC ACID FROM A POLYETHYLENE TEREPHTHALATE, WHICH COMPRISES HEATING A REACTION MIXTURE CONSISTING ESSENTIALLY OF POLYETHYLENE TEREPHTHALATE AND WATER AT A TEMPERATURE OF 230-250*C. TO BRING ABOUT HYDROLYSIS INTO ETHYLENE GLYCOL AND TEREPHTHALIC ACID.
Claim 2
Dependent Claim
39 words
PROCESS FOR THE PRODUCTION OF TEREPHTHALIC ACID FROM A POLYETHYLENE TEREPHTHALATE, WHICH COMPRISES HEATING A REACTION MIXTURE CONSISTING ESSENTIALLY OF POLYETHYLENE TEREPHTHALATE AND WATER AT A TEMPERATURE OF 230-250*C. TO BRING ABOUT HYDROLYSIS INTO ETHYLENE GLYCOL AND TEREPHTHALIC ACID.
References Cited (Backward Citations)
GB610135A
Cited
US2793235A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-02-03 | 1967-08-05 | 1968-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-02-03 | 1971-08-05 | 1972-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-02-03 | 1975-08-05 | 1976-02-04 | $7700.00 | Window Closed / Lapsed |