US2831866A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heterocyclic compounds
Assignee: May and Baker Ltd
•
Filing: 1956-05-14
•
Granted: 1958-04-22
•
Expires: 1976-05-14
Abstract
No abstract record available.
Inventors
- 👤 Freeman Wilfred Arthur
- 👤 Pain David Lord
- 👤 Slack Ronald
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:23
CPC Classifications
C; C07; C07D; C07D231/00; C07D231/02; C07D231/10; C07D231/14; C07D231/38; C07D231/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
5 words
A PYRIDYL-4-NITROSOPYRAZOLE HAVING THE FORMULA:
Claim 2
Dependent Claim
5 words
A PYRIDYL-4-NITROSOPYRAZOLE HAVING THE FORMULA:
References Cited (Backward Citations)
US2510724A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-04-21 | 1961-10-21 | 1962-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-04-21 | 1965-10-21 | 1966-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-04-21 | 1969-10-21 | 1970-04-22 | $7700.00 | Window Closed / Lapsed |