US2819307A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of n-tert-butyl formamide
Assignee: Bridgestone Firestone Inc
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Filing: 1953-09-14
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Granted: 1958-01-07
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Expires: 1973-09-14
Abstract
No abstract record available.
Inventors
- 👤 Harry E Albert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 15:03
CPC Classifications
C; C07; C07C; C07C233/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
91 words
METHOD OF PRODUCING N-TERT-BUTYLFORMAMIDE WHICH ESSENTIALLY CONSISTS IN REACTING ONE MOLE OF ISOBUTYLENE WITH SLIGHTLY MORE THAN ONE MOLE OF HYDROGEN CYANIDE IN THE PRESENCE OF 1.5 TO 2.5 MOLES OF AQUEOUS SULFURIC ACID CONTAINING SUBSTANTIALLY 13 TO 18% WATER, THE ISOBUTYLENE BEING GRADUALLY ADDED TO THE SULFURIC ACID CONTAINING HYDROGEN CYANIDE AT A TEMPERATURE OF APPROXIMATELY 20 TO 25*C., THEREAFTER HEATING THE REACTION MIXTURE TO APPROXIMATELY 60*C., NEUTRALIZING THE RESULTING ACIDIC REACTION PRODUCT WITH AMMONIA, AND SEPARATING THE RESULTING FORMAMIDE FROM THE AQUEOUS LIQUID CONTAINING DISSOLVED AMMONIUM SULFATE. AMMONIUM SULFATE.
Claim 2
Dependent Claim
91 words
METHOD OF PRODUCING N-TERT-BUTYLFORMAMIDE WHICH ESSENTIALLY CONSISTS IN REACTING ONE MOLE OF ISOBUTYLENE WITH SLIGHTLY MORE THAN ONE MOLE OF HYDROGEN CYANIDE IN THE PRESENCE OF 1.5 TO 2.5 MOLES OF AQUEOUS SULFURIC ACID CONTAINING SUBSTANTIALLY 13 TO 18% WATER, THE ISOBUTYLENE BEING GRADUALLY ADDED TO THE SULFURIC ACID CONTAINING HYDROGEN CYANIDE AT A TEMPERATURE OF APPROXIMATELY 20 TO 25*C., THEREAFTER HEATING THE REACTION MIXTURE TO APPROXIMATELY 60*C., NEUTRALIZING THE RESULTING ACIDIC REACTION PRODUCT WITH AMMONIA, AND SEPARATING THE RESULTING FORMAMIDE FROM THE AQUEOUS LIQUID CONTAINING DISSOLVED AMMONIUM SULFATE. AMMONIUM SULFATE.
References Cited (Backward Citations)
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Cited
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-01-06 | 1961-07-08 | 1962-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-01-06 | 1965-07-08 | 1966-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-01-06 | 1969-07-08 | 1970-01-07 | $7700.00 | Window Closed / Lapsed |