Patent US2990404A successfully refreshed from Google Patents.
US2990404A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recovery of s-amlnoiiexahydro-
Assignee: —
•
Filing: —
•
Granted: 1961-06-27
•
Expires: 1978-06-27
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:17
CPC Classifications
C; C07; C07D; C07D239/00; C07D239/02; C07D239/04
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
12 words
IN A PROCESS FOR THE PURIFICATION OF 5-AMINOHEXAHYDROPYRIMIDINES HAVING THE FOLLOWING FORMULA
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) | 1964-06-26 | 1964-12-26 | 1965-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-06-26 | 1968-12-26 | 1969-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-06-26 | 1972-12-26 | 1973-06-27 | $7700.00 | Window Closed / Lapsed |