US2980678A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pyrimidines
Assignee: Imperial Chemical Industries Ltd
•
Filing: 1958-12-15
•
Granted: 1961-04-18
•
Expires: 1978-12-15
Abstract
No abstract record available.
Inventors
- 👤 Langley Bernard William
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:15
CPC Classifications
C; C07; C07D; C07D239/00; C07D239/02; C07D239/24; C07D239/28; C07D239/46; C07D239/52; C07D239/54
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
5 words
4- HYDRAZINO-2:6-DIHYDROXYPYRIMIDINES OF THE FOR-
Claim 2
Dependent Claim
5 words
4- HYDRAZINO-2:6-DIHYDROXYPYRIMIDINES OF THE FOR-
References Cited (Backward Citations)
US2211710A
Cited
US2487569A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-04-17 | 1964-10-17 | 1965-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-04-17 | 1968-10-17 | 1969-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-04-17 | 1972-10-17 | 1973-04-18 | $7700.00 | Window Closed / Lapsed |