US2553055A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Synthesis of 5-(sec.-butyl) hydantion
Assignee: Dow Chemical Co
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Filing: 1946-11-07
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Granted: 1951-05-15
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Expires: 1966-11-07
Abstract
No abstract record available.
Inventors
- 👤 John E Livak
- 👤 Edgar C Britton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:28
CPC Classifications
C; C07; C07D; C07D233/00; C07D233/54; C07D233/66; C07D233/72; C07D233/74
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
88 words
A METHOD WHICH COMPRISES ADMIXING ONE MOLECULAR EQUIVALENT OF ALPHA-METHYL-BUTYRALDEHYDE WITH AN AQUEOUS SOLUTION OF AT LEAST ONE MOLE OF AN ALKALI METAL CYANIDE AND AT LEAST 1.5 MOLES OF AT LEAST ONE WATER-SOLUBLE INORGANIC AMMONIUM SALT INCLUDING AT LEAST ONE MOLE OF AMMONIUM CARBONATE, HEATING THE MIXTURE TO A REACTION TEMPERATURE BETWEEN 40* AND 120* C., ADDING A STRONG MINERAL ACID IN AMOUNT SUFFICIENT TO BRING THE MIXTURE TO A PH VALUE OF LESS THAN 4, COOLING THE MIXTURE AND SEPARATING THE 5-(SEC.-BUTYL) HYDANTOIN WHICH IS PRECIPITATED.
Claim 2
Independent Claim
88 words
A METHOD WHICH COMPRISES ADMIXING ONE MOLECULAR EQUIVALENT OF ALPHA-METHYL-BUTYRALDEHYDE WITH AN AQUEOUS SOLUTION OF AT LEAST ONE MOLE OF AN ALKALI METAL CYANIDE AND AT LEAST 1.5 MOLES OF AT LEAST ONE WATER-SOLUBLE INORGANIC AMMONIUM SALT INCLUDING AT LEAST ONE MOLE OF AMMONIUM CARBONATE, HEATING THE MIXTURE TO A REACTION TEMPERATURE BETWEEN 40* AND 120* C., ADDING A STRONG MINERAL ACID IN AMOUNT SUFFICIENT TO BRING THE MIXTURE TO A PH VALUE OF LESS THAN 4, COOLING THE MIXTURE AND SEPARATING THE 5-(SEC.-BUTYL) HYDANTOIN WHICH IS PRECIPITATED.
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) | 1954-05-14 | 1954-11-13 | 1955-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-05-14 | 1958-11-13 | 1959-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-05-14 | 1962-11-13 | 1963-05-15 | $7700.00 | Window Closed / Lapsed |