Patent US2190881A successfully refreshed from Google Patents.
Patent US2980505A successfully refreshed from Google Patents.
US2980505A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of producing alkali metal salts of urea
Assignee: Feldmuehle AG
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Filing: 1958-11-12
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Granted: 1961-04-18
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Expires: 1978-11-12
Abstract
No abstract record available.
Inventors
- 👤 Hass Karl
- 👤 Deselaers Kurt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 02:07
CPC Classifications
C; C07; C07C; C07C273/00; C07C273/02
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
91 words
IN A PROCESS OF PRODUCING ALKALI METAL CYANATES, THE STEPS WHICH COMPRISE INTIMATELY MIXING FINELY PULVERIZED SOLID UREA WITH A FINELY PULVERIZED SOLID ALKALI METAL ALCOHOLATE, HEATING THE RESULTING MIXTURE AT A TEMPERATURE BELOW 100*C. UNTIL NO MORE ALCOHOL IS SPLIT OFF, SAID TEMPERATURE BEING HIGHER THAN THE BOILING POINT OF SAID ALCOHOL IN SAID MIXTURE, SEPARATING SAID ALCOHOL FROM SAID MIXTURE IN THE GASEOUS STATE, AND INCREASING THE TEMPERATURE OF THE RESULTING ALKALI METAL SALT OF UREA TO A TEMPERATURE SUBSTANTIALLY EXCEEDING 100*C. UNTIL NO MORE AMMONIA IS SPLIT OFF.
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) | 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 |