US2861079A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for making unsaturated hydantoins
Assignee: Dow Chemical Co
•
Filing: 1956-06-04
•
Granted: 1958-11-18
•
Expires: 1976-06-04
Abstract
No abstract record available.
Inventors
- 👤 Edgar C Britton
- 👤 Howard T Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 16:38
CPC Classifications
C; C07; C07D; C07D233/00; C07D233/96
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
116 words
IN A PROCESS FOR MAKING AN UNSATURATED HYDANTION WHEREIN HYDANTOIN IS REACTED WITH AN ALDEHYDE, THE STEPS WHICH CONSIST IN HEATING APPROXIMATELY EQUIMOLECULAR PROPORTIONS OF HYDANTOIN AND AN ALDEHYDE CONTAINING AT LEAST 4 CARBON ATOMS IN THE MOLECULE AT REACTION TEMPERATURES BETWEEN 50* AND 150*C. WHILE HAVING THE REACTANTS DISSOLVED IN A LIQUID REACTION MEDIUM SELECTED FROM THE GROUP CONSISTING OF WATER, A LOWER ALIPHATIC ALCOHOL CONTAINING FROM 1 TO 4 CARBON ATOMS IN TYHE MOLECULE AND MIXTURES OF WATER AND SUCH ALCOHOLS, AND A MONOALKANOLAMINE CONTAINING FROM 2 TO 4 CARBON ATOMS IN THE MOLECULE IN AMOUNT CORRESPONDING TO FROM 0.2 TO 10 GRAM MOLECULAR PROPORTIONS OF THE MONOLAKANOLAMINE PER GRAM MOLE OF THE HYDANTOIN.
Claim 2
Dependent Claim
116 words
IN A PROCESS FOR MAKING AN UNSATURATED HYDANTION WHEREIN HYDANTOIN IS REACTED WITH AN ALDEHYDE, THE STEPS WHICH CONSIST IN HEATING APPROXIMATELY EQUIMOLECULAR PROPORTIONS OF HYDANTOIN AND AN ALDEHYDE CONTAINING AT LEAST 4 CARBON ATOMS IN THE MOLECULE AT REACTION TEMPERATURES BETWEEN 50* AND 150*C. WHILE HAVING THE REACTANTS DISSOLVED IN A LIQUID REACTION MEDIUM SELECTED FROM THE GROUP CONSISTING OF WATER, A LOWER ALIPHATIC ALCOHOL CONTAINING FROM 1 TO 4 CARBON ATOMS IN TYHE MOLECULE AND MIXTURES OF WATER AND SUCH ALCOHOLS, AND A MONOALKANOLAMINE CONTAINING FROM 2 TO 4 CARBON ATOMS IN THE MOLECULE IN AMOUNT CORRESPONDING TO FROM 0.2 TO 10 GRAM MOLECULAR PROPORTIONS OF THE MONOLAKANOLAMINE PER GRAM MOLE OF THE HYDANTOIN.
References Cited (Backward Citations)
US2435399A
Cited
US2605282A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-11-17 | 1962-05-19 | 1962-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-11-17 | 1966-05-19 | 1966-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-11-17 | 1970-05-19 | 1970-11-18 | $7700.00 | Window Closed / Lapsed |