Patent US3037028A successfully refreshed from Google Patents.
US3037028A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Synthesis of imidazoles
Assignee: Air Products and Chemicals Inc
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Filing: 1959-07-06
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Granted: 1962-05-29
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Expires: 1979-07-06
Abstract
No abstract record available.
Inventors
- 👤 Harold A Green
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:12
CPC Classifications
C; C07; C07D; C07D233/00; C07D233/54
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
94 words
THE METHOD OF PREPARING DIAZA-HETEROCYCLIC COMPOUNDS WHICH COMPRISES REACTING IN VAPOR PHASE ALKYLENE DIAMINE WITH AN OXY-CARBON COMPOUND CONTAINING A REACTIVE CH GROUP, AT A TEMPERATURE IN THE RANGE OF 600-900* F. AND IN HTE PRESENCE OF A DUAL-FUNCTION CATALYST HAVING DEHYDRATION AND DEHYDROGENATION ACTIVITY, SAID ALKYLENE DIAMINE BEING ONE HAVING 2 TO 4 CARBON ATOMS IN THE ALKYLENE CHAIN THEREOF, WITH THE AMINO GROUPS SPACED NO FURTHER APART THAN ON ALTERNATE CARBON ATOMS OF SAID CHAIN AND SAID OXY-CARBON COMPOUND BEING SELECTED FROM THE GROUP CONSISTING OF ALDEHYDES AND ALCOHOLS OF THE FORMULAE
Claim 2
Independent Claim
94 words
THE METHOD OF PREPARING DIAZA-HETEROCYCLIC COMPOUNDS WHICH COMPRISES REACTING IN VAPOR PHASE ALKYLENE DIAMINE WITH AN OXY-CARBON COMPOUND CONTAINING A REACTIVE CH GROUP, AT A TEMPERATURE IN THE RANGE OF 600-900* F. AND IN HTE PRESENCE OF A DUAL-FUNCTION CATALYST HAVING DEHYDRATION AND DEHYDROGENATION ACTIVITY, SAID ALKYLENE DIAMINE BEING ONE HAVING 2 TO 4 CARBON ATOMS IN THE ALKYLENE CHAIN THEREOF, WITH THE AMINO GROUPS SPACED NO FURTHER APART THAN ON ALTERNATE CARBON ATOMS OF SAID CHAIN AND SAID OXY-CARBON COMPOUND BEING SELECTED FROM THE GROUP CONSISTING OF ALDEHYDES AND ALCOHOLS OF THE FORMULAE
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-05-28 | 1965-11-27 | 1966-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-05-28 | 1969-11-27 | 1970-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-05-28 | 1973-11-27 | 1974-05-29 | $7700.00 | Window Closed / Lapsed |