US2731491A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Condensation product of naphthenic acids and phenols and methods of making same
Assignee: Gulf Research and Development Co
•
Filing: 1953-04-02
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Granted: 1956-01-17
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Expires: 1973-04-02
Abstract
No abstract record available.
Inventors
- 👤 Oliver L Brandes
- 👤 Earl L Humphrey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:54
CPC Classifications
C; C07; C07C; C07C67/00; C07C67/08; C07C2/00; C07C2/54; C07C2/64; C07C2/66; C07C37/00; C07C37/11; C07C37/14; C07C37/20; C07C39/00; C07C39/02; C07C39/04; C07C39/06; C07C39/12; C07C39/15
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
51 words
A METHOD OF PREPARING A NEW COMPOUND, WHICH COMPRISES REACTING A MIXTURE COMPRISING NAPHTHENIC ACIDS AND AT LEAST ONE PHENOL IN THE PRESENCE OF A FRIEDELCRAFTS CATALYST AT AN ELEVATED TEMPERATURE OF AT LEAST ABOUT 200* F. FOR A TIME SUFFICIENT TO EFFECT REACTION BETWEEN THE NAPHTHENIC ACIDS AND THE PHENOL.
Claim 2
Independent Claim
51 words
A METHOD OF PREPARING A NEW COMPOUND, WHICH COMPRISES REACTING A MIXTURE COMPRISING NAPHTHENIC ACIDS AND AT LEAST ONE PHENOL IN THE PRESENCE OF A FRIEDELCRAFTS CATALYST AT AN ELEVATED TEMPERATURE OF AT LEAST ABOUT 200* F. FOR A TIME SUFFICIENT TO EFFECT REACTION BETWEEN THE NAPHTHENIC ACIDS AND THE PHENOL.
Claim 3
Independent Claim
47 words
A METHOD OF PREPARING A NEW COMPOUND, WHICH COMPRISES REACTING A MIXTURE COMPRISING NAPHTHENIC ACIDS AND P-CRESOL IN THE PRESENCE OF A FRIEDEL-CRAFTS CATALYST AT AN ELEVATED TEMPERATURE OF AT LEAST ABOUT 300* F. FOR A TIME SUFFICIENT TO EFFECT REACTION BETWEEN THE NAPHTHENIC ACIDS AND P-CRESOL.
Claim 4
Independent Claim
47 words
A METHOD OF PREPARING A NEW COMPOUND, WHICH COMPRISES REACTING A MIXTURE COMPRISING NAPHTHENIC ACIDS AND P-CRESOL IN THE PRESENCE OF A FRIEDEL-CRAFTS CATALYST AT AN ELEVATED TEMPERATURE OF AT LEAST ABOUT 300* F. FOR A TIME SUFFICIENT TO EFFECT REACTION BETWEEN THE NAPHTHENIC ACIDS AND P-CRESOL.
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) | 1959-01-16 | 1959-07-18 | 1960-01-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-01-16 | 1963-07-18 | 1964-01-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-01-16 | 1967-07-18 | 1968-01-17 | $7700.00 | Window Closed / Lapsed |