US2557904A
Expired / Lapsed
US
⏱️ 0.0 years remaining
5-(2-tetrahydrofuryl) hydantoin and production therefrom of 5-(4-hydroxybutyl) hydantoin
Assignee: Dow Chemical Co
•
Filing: 1949-04-21
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Granted: 1951-06-19
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Expires: 1969-04-21
Abstract
No abstract record available.
Inventors
- 👤 Edgar C Britton
- 👤 Yancey J Dickert
- 👤 Halbert C White
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:07
CPC Classifications
C; C07; C07D; C07D405/00; C07D405/02; C07D405/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
47 words
A METHOD WHICH COMPRISES REACTING TETRAHYDROFURFURALDEHYDE WITH AN AQUEOUS SOLUTION OF AN ALKALI METAL CYANIDE AND AN AMMONIUM CARBONATE AT TEMPERATURES BETWEEN 40* AND 120* C. TO FORM 5-2(TETRAHYDROFURYL) HYDANTOIN, AND HYDROGENATING THE LATTER IN THE PRESENCE OF A CATALYST TO FORM 5-(2-HYDROXYBUTYL) HYDANTOIN. 4. 5-(2-TETRAHYDROFURYL) HYDANTOIN.
Claim 2
Independent Claim
47 words
A METHOD WHICH COMPRISES REACTING TETRAHYDROFURFURALDEHYDE WITH AN AQUEOUS SOLUTION OF AN ALKALI METAL CYANIDE AND AN AMMONIUM CARBONATE AT TEMPERATURES BETWEEN 40* AND 120* C. TO FORM 5-2(TETRAHYDROFURYL) HYDANTOIN, AND HYDROGENATING THE LATTER IN THE PRESENCE OF A CATALYST TO FORM 5-(2-HYDROXYBUTYL) HYDANTOIN. 4. 5-(2-TETRAHYDROFURYL) HYDANTOIN.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-06-18 | 1954-12-18 | 1955-06-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-06-18 | 1958-12-18 | 1959-06-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-06-18 | 1962-12-18 | 1963-06-19 | $7700.00 | Window Closed / Lapsed |