Patent US2849451A successfully refreshed from Google Patents.
US2849451A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of s-triazines
Assignee: Wyeth Holdings LLC
•
Filing: 1957-04-22
•
Granted: 1958-08-26
•
Expires: 1977-04-22
Abstract
No abstract record available.
Inventors
- 👤 Hechenbleikner Ingenuin
- 👤 Peters Grace
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:52
CPC Classifications
C; C07; C07D; C07D251/00; C07D251/02; C07D251/12; C07D251/14; C07D251/24
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
33 words
AN IMPROVED METHOD FOR PREPARING SUBSTITUTED S-TRIAZINES WHICH COMPRISES: HEATING AT TEMPERATURE BETWEEN 180*C. AND 275*C. TO FUSE AT LEAST EQUIMOLECULAR QUANTITIES OF FORMAMIDINE HYDROHALIDE AND AN AMIDINE COMPOUND REPRESENTED BY THE FORMULA:
Claim 2
Dependent Claim
33 words
AN IMPROVED METHOD FOR PREPARING SUBSTITUTED S-TRIAZINES WHICH COMPRISES: HEATING AT TEMPERATURE BETWEEN 180*C. AND 275*C. TO FUSE AT LEAST EQUIMOLECULAR QUANTITIES OF FORMAMIDINE HYDROHALIDE AND AN AMIDINE COMPOUND REPRESENTED BY THE FORMULA:
References Cited (Backward Citations)
US2598811A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-08-25 | 1962-02-24 | 1962-08-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-08-25 | 1966-02-24 | 1966-08-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-08-25 | 1970-02-24 | 1970-08-26 | $7700.00 | Window Closed / Lapsed |