US2877261A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for naphthalene thioglycollic acids
Assignee: Wyeth Holdings LLC
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Filing: 1957-03-25
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Granted: 1959-03-10
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Expires: 1977-03-25
Abstract
No abstract record available.
Inventors
- 👤 William B Hardy
- 👤 Jack H Thelin
- 👤 Frank M Furman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 05:21
CPC Classifications
C; C07; C07C; C07C323/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
95 words
A PROCESS FOR THE PREPARATION OF S-THIOGLYCOLLIC ACID DERIVATIVES OF NAPHTALENE IN WHICH THE NAPHTHALENE RING IS DIRECTLY BONDED TO SULFUR WHICH COMPRISES HEATING TO A TEMPERATURE BETWEEN AMBIENT AND 175* C. A MIXTURE OF A NAPHTHALENE CONTAINING SUBSTITUENTS SELECTED FROM THE GROUP CONSISTING OF OXY AND LOWER ALKOXY GROUPS WITH A SALT OF AN S-ESTER OF THIOSULFURIC ACID OF THE STRUCTURE: MO-SO2-S-CH2-X IN WHICH M IS A CATION OTHER THAN HYDROGEN AND X IS OF THE GROUP CONSISTING OF CARBOXY, CARBOXY ESTERS, CARBOXAMIDE, SUBSTITUTED CARBOXAMIDES, AND NITRILE, IN THE PRESENCE OF AN ACID CATALYST.
Claim 2
Dependent Claim
95 words
A PROCESS FOR THE PREPARATION OF S-THIOGLYCOLLIC ACID DERIVATIVES OF NAPHTALENE IN WHICH THE NAPHTHALENE RING IS DIRECTLY BONDED TO SULFUR WHICH COMPRISES HEATING TO A TEMPERATURE BETWEEN AMBIENT AND 175* C. A MIXTURE OF A NAPHTHALENE CONTAINING SUBSTITUENTS SELECTED FROM THE GROUP CONSISTING OF OXY AND LOWER ALKOXY GROUPS WITH A SALT OF AN S-ESTER OF THIOSULFURIC ACID OF THE STRUCTURE: MO-SO2-S-CH2-X IN WHICH M IS A CATION OTHER THAN HYDROGEN AND X IS OF THE GROUP CONSISTING OF CARBOXY, CARBOXY ESTERS, CARBOXAMIDE, SUBSTITUTED CARBOXAMIDES, AND NITRILE, IN THE PRESENCE OF AN ACID CATALYST.
References Cited (Backward Citations)
DE814596C
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-03-09 | 1962-09-08 | 1963-03-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-03-09 | 1966-09-08 | 1967-03-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-03-09 | 1970-09-08 | 1971-03-10 | $7700.00 | Window Closed / Lapsed |