US2688023A
Expired / Lapsed
US
⏱️ 0.0 years remaining
5-(3-cyanopropyl) hydantoin and its preparation and use to prepare 5-(4-aminobutyl) hydantoin
Assignee: EIDP Inc
•
Filing: 1952-06-27
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Granted: 1954-08-31
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Expires: 1972-06-27
Abstract
No abstract record available.
Inventors
- 👤 Arthur O Rogers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 19:15
CPC Classifications
C; C07; C07D; C07D233/00; C07D233/54; C07D233/66; C07D233/72; C07D233/76
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
2 words
5-(3-CYANOPROPYL) HYDANTOIN.
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) | 1957-08-30 | 1958-03-01 | 1958-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-08-30 | 1962-03-01 | 1962-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-08-30 | 1966-03-01 | 1966-08-31 | $7700.00 | Window Closed / Lapsed |