Patent US3157673A successfully refreshed from Google Patents.
US3157673A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process foe the pkeparation of thio-
Assignee: —
•
Filing: —
•
Granted: 1964-11-17
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Expires: 1981-11-17
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 03:31
CPC Classifications
C; C07; C07D; C07D307/00; C07D307/02; C07D307/34; C07D307/56; C07D307/68; C07D333/00; C07D333/02; C07D333/04; C07D333/26; C07D333/38; C07D333/40
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
41 words
PROCESS FOR THE MANUFACTURE OF THIPHENE-2,5-DICARBOXYLIC ACID, WHICH COMPRISES TREATING TETRAHYDROTHIOPHENE-2,5-DICARBOXYLIC ACID IN AQUEOUS MINERAL ACIDIC MEDIUM WITH MOLECULAR CHLORINE AND THEN SPLITTING OFF HYDROGEN CHLORIDE FROM THE RESULTING CHLORINATION PRODUCT IN THE AQUEOUS MINERAL ACIDIC MEDIUM AT AN ELEVATED TEMPERATURE.
Claim 2
Dependent Claim
41 words
PROCESS FOR THE MANUFACTURE OF THIPHENE-2,5-DICARBOXYLIC ACID, WHICH COMPRISES TREATING TETRAHYDROTHIOPHENE-2,5-DICARBOXYLIC ACID IN AQUEOUS MINERAL ACIDIC MEDIUM WITH MOLECULAR CHLORINE AND THEN SPLITTING OFF HYDROGEN CHLORIDE FROM THE RESULTING CHLORINATION PRODUCT IN THE AQUEOUS MINERAL ACIDIC MEDIUM AT AN ELEVATED TEMPERATURE.
References Cited (Backward Citations)
DE405017C
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-11-17 | 1968-05-18 | 1968-11-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-11-17 | 1972-05-18 | 1972-11-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-11-17 | 1976-05-18 | 1976-11-17 | $7700.00 | Window Closed / Lapsed |