US2731472A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of heterocyclic compounds
Assignee: —
•
Filing: —
•
Granted: 1956-01-17
•
Expires: 1973-01-17
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 09:09
CPC Classifications
C; C07; C07D; C07D487/00; C07D487/02; C07D487/04; C07D233/00; C07D233/04; C07D233/28; C07D233/30; C07D233/32
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
48 words
A PROCESS FOR THE PRODUCTION OF 4,5-DIHYDROXY IMIDAZOLIDONE-2 WHICH COMPRISES ADJUSTING AN AQUEOUS GLYOXAL SOLUTION BY THE ADDITION OF AN INORGANIC ACID BINDING AGENT TO A PH VALUE OF FROM 5 TO 9 AND REACTING THIS SOLUTION WTIH THE UREA UNTIL THE CRYSTALLINE 4,5-DIHYDROXY IMIDAZOLIDONE-2 HAS BEEN FORMED.
Claim 2
Dependent Claim
48 words
A PROCESS FOR THE PRODUCTION OF 4,5-DIHYDROXY IMIDAZOLIDONE-2 WHICH COMPRISES ADJUSTING AN AQUEOUS GLYOXAL SOLUTION BY THE ADDITION OF AN INORGANIC ACID BINDING AGENT TO A PH VALUE OF FROM 5 TO 9 AND REACTING THIS SOLUTION WTIH THE UREA UNTIL THE CRYSTALLINE 4,5-DIHYDROXY IMIDAZOLIDONE-2 HAS BEEN FORMED.
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) | 1959-01-16 | 1959-07-18 | 1960-01-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-01-16 | 1963-07-18 | 1964-01-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-01-16 | 1967-07-18 | 1968-01-17 | $7700.00 | Window Closed / Lapsed |