US2760992A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Naphthalene
Assignee: —
•
Filing: —
•
Granted: 1956-08-28
•
Expires: 1973-08-28
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 12:09
CPC Classifications
C; C07; C07C; C07C37/00; C07C37/01; C07C37/04; C07C303/00; C07C303/32
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
116 words
IN A METHOD FOR PRODUCING BETA-NAPHTHOL WHEREIN NAPHTHALENE IS FIRST SULFONATED WITH SULFURIC ACID AND THE SULFONATE STEAMED TO FORM AN ACID MIXTURE COMPRISING ESSENTIALLY BETA-NAPHTHALENESULFONIC ACID, SULFURIC ACID AND WATER AND THE ACID MIXTURE SUBSEQUENTLY MIXED WITH STRONG AQUEOUS METAL HYDROXIDE TO FORM AN ALKALINE MIXTURE AND THE LATTER HEATED TO CONVERT THE RESULTING BETANAPHTHALENESULFONIC ACID SALT TO BETA-NAPHTHOL, THE STEP WHICH INCLUDES: MIXING THE ACID MIXTURE AND THE STRONG AQUEOUS ALKALI METAL HYDROXIDE AT A TEMPERATURE OF AT LEAST NINETY DEGREES CENTIGRADE AND A PRESSURE OF AT LEAST THE VAPOR PRESSURE OF THE REACTION MIXTURE AND IN THE PRESENCE OF SUFFICIENT VIGOROUS AGITATION TO CAUSE A THIN SLURRY OF ALKALI MIXTURE TO BE PREPARED.
Claim 2
Dependent Claim
116 words
IN A METHOD FOR PRODUCING BETA-NAPHTHOL WHEREIN NAPHTHALENE IS FIRST SULFONATED WITH SULFURIC ACID AND THE SULFONATE STEAMED TO FORM AN ACID MIXTURE COMPRISING ESSENTIALLY BETA-NAPHTHALENESULFONIC ACID, SULFURIC ACID AND WATER AND THE ACID MIXTURE SUBSEQUENTLY MIXED WITH STRONG AQUEOUS METAL HYDROXIDE TO FORM AN ALKALINE MIXTURE AND THE LATTER HEATED TO CONVERT THE RESULTING BETANAPHTHALENESULFONIC ACID SALT TO BETA-NAPHTHOL, THE STEP WHICH INCLUDES: MIXING THE ACID MIXTURE AND THE STRONG AQUEOUS ALKALI METAL HYDROXIDE AT A TEMPERATURE OF AT LEAST NINETY DEGREES CENTIGRADE AND A PRESSURE OF AT LEAST THE VAPOR PRESSURE OF THE REACTION MIXTURE AND IN THE PRESENCE OF SUFFICIENT VIGOROUS AGITATION TO CAUSE A THIN SLURRY OF ALKALI MIXTURE TO BE PREPARED.
References Cited (Backward Citations)
US1922813A
Cited
GB649945A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-08-28 | 1960-02-27 | 1960-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-08-28 | 1964-02-27 | 1964-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-08-28 | 1968-02-27 | 1968-08-28 | $7700.00 | Window Closed / Lapsed |