Patent US2049692A successfully refreshed from Google Patents.
Patent US2526477A successfully refreshed from Google Patents.
US2526477A
Expired / Lapsed
US
⏱️ 0.0 years remaining
5-hydroxy-1, 3, 4-triazaindolizines and process of preparing the same
Assignee: GAF Chemicals Corp
•
Filing: 1949-10-21
•
Granted: 1950-10-17
•
Expires: 1969-10-21
Abstract
No abstract record available.
Inventors
- 👤 Heimbach Newton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 03:18
CPC Classifications
C; C07; C07D; C07D487/00; C07D487/02; C07D487/04; G; G03; G03C; G03C1/00; G03C1/005; G03C1/06; G03C1/34
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
5 words
COMPOUNDS OF THE GENERAL FORMULA:
Claim 2
Dependent Claim
5 words
COMPOUNDS OF THE GENERAL 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) | 1953-10-16 | 1954-04-17 | 1954-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-10-16 | 1958-04-17 | 1958-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-10-16 | 1962-04-17 | 1962-10-17 | $7700.00 | Window Closed / Lapsed |