US2558507A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of thiophene compounds from mono-olefins and hydrogen sulfide with alumina catalyst
Assignee: Shell Development Co
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Filing: 1945-09-05
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Granted: 1951-06-26
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Expires: 1965-09-05
Abstract
No abstract record available.
Inventors
- 👤 Walter G Appleby
- 👤 Albin F Sartor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 23:38
CPC Classifications
C; C07; C07D; C07D333/00; C07D333/02; C07D333/04; C07D333/06; C07D333/08; C07D333/10
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
98 words
A PROCESS FOR THE PRODUCTION OF THIOPHENES WHICH CONSISTS OF CANTACTING A NORMALLY GASEOUS MONO-OLEFIN IN ADMIXTURE WITH HYDROGEN SULFIDE IN A MOLAR RATIO OF HYDROGEN SULFIDE TO OLEFIN OF FROM ABOUT 2:1 TO ABOUT 6:1 WITH ADSROPTIVE ALUMINA FOR A CONTACT TIME IN THE RANGE OF FROM 10 TO 30 SECONDS AT A TEMPERATURE OF FROM ABOUT 400* C. TO ABOUT 750* C. IN A REACTION ZONE, THEREBY REACTING SAID OLEFIN WITH HYDROGEN SULFIDE WITH THE FORMATION OF THIOPHENES IN SAID REACTION ZONE, SEPARATING THIOPHENSE AND HYDROGEN SULFIDE FROM SAID SEPARATED HYDROGEN SULFIDE TO SAID REACTION ZONE.
References Cited (Backward Citations)
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Cited
US2336916A
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US2369377A
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US2315107A
Cited
US2428727A
Cited
US2474440A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-06-25 | 1954-12-25 | 1955-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-06-25 | 1958-12-25 | 1959-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-06-25 | 1962-12-25 | 1963-06-26 | $7700.00 | Window Closed / Lapsed |