US2520619A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of triethylenemelamine
Assignee: Wyeth Holdings LLC
•
Filing: 1948-10-05
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Granted: 1950-08-29
•
Expires: 1968-10-05
Abstract
No abstract record available.
Inventors
- 👤 Vernon P Wystrach
- 👤 Donald W Kaiser
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 13:26
CPC Classifications
C; C07; C07D; C07D403/00; C07D403/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
48 words
THE METHOD COMPRISING ADMIXING WATER, CYANURIC CHLORIDE, ETHYLENIMINE, AND A HYDROGEN CHLORIDE ACCEPTOR OF THE GROUP CONSISTING OF THE ALKALI METAL HYDROXIDES, ALKALI METAL CARBONATES, ALKALINE EARTH HYDROXIDES, AND ALKALINE EARTH CARBONATES, AT A TEMPERATURE BELOW 20*C. WHEREBY HYDROGEN CHLORIDE AND TRIETHYLENEMELAMINE ARE FORMED, AND RECOVERING THE LATTER.
Claim 2
Independent Claim
48 words
THE METHOD COMPRISING ADMIXING WATER, CYANURIC CHLORIDE, ETHYLENIMINE, AND A HYDROGEN CHLORIDE ACCEPTOR OF THE GROUP CONSISTING OF THE ALKALI METAL HYDROXIDES, ALKALI METAL CARBONATES, ALKALINE EARTH HYDROXIDES, AND ALKALINE EARTH CARBONATES, AT A TEMPERATURE BELOW 20*C. WHEREBY HYDROGEN CHLORIDE AND TRIETHYLENEMELAMINE ARE FORMED, AND RECOVERING THE LATTER.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-08-28 | 1954-02-27 | 1954-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-08-28 | 1958-02-27 | 1958-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-08-28 | 1962-02-27 | 1962-08-29 | $7700.00 | Window Closed / Lapsed |