Patent US2888484A successfully refreshed from Google Patents.
US2888484A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of hexahydroterephthalic acid
Assignee: Hercules Powder Co
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Filing: 1957-09-09
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Granted: 1959-05-26
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Expires: 1977-09-09
Abstract
No abstract record available.
Inventors
- 👤 Henry C Dehm
- 👤 Lucien G Maury
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 08:09
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/347; C07C51/36
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
65 words
A PROCESS FOR THE PRODUCTION OF HEXAHY DROTEREPHTHALIC ACID WHICH COMPRISES SUBJECTING TEREPHTHALIC ACID TO THE ACTION OF HYDROGEN AT AN ELEVATED TEMPERATURE WITHIN THE RANGE OF 150-300*C. AND AT A PRESSURE OF AT LEAST 1000 P.S.I.G. IN THE PRSENCE OF A PALLADIUM CATALYST AND IN THE PRESENCE OF AN INERT LIQUID MEDIUM IN WHICH TEREPHTHALIC ACID IS AT LEAST PARTIALLY SOLUBLE UNDER REACTION CONDITIONS.
Claim 2
Dependent Claim
65 words
A PROCESS FOR THE PRODUCTION OF HEXAHY DROTEREPHTHALIC ACID WHICH COMPRISES SUBJECTING TEREPHTHALIC ACID TO THE ACTION OF HYDROGEN AT AN ELEVATED TEMPERATURE WITHIN THE RANGE OF 150-300*C. AND AT A PRESSURE OF AT LEAST 1000 P.S.I.G. IN THE PRSENCE OF A PALLADIUM CATALYST AND IN THE PRESENCE OF AN INERT LIQUID MEDIUM IN WHICH TEREPHTHALIC ACID IS AT LEAST PARTIALLY SOLUBLE UNDER REACTION CONDITIONS.
References Cited (Backward Citations)
US2828335A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-05-25 | 1962-11-24 | 1963-05-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-05-25 | 1966-11-24 | 1967-05-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-05-25 | 1970-11-24 | 1971-05-26 | $7700.00 | Window Closed / Lapsed |