Patent US4548458A successfully refreshed from Google Patents.
Patent US2797979A successfully refreshed from Google Patents.
US2797979A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of cyanamides
Assignee: Individual
•
Filing: 1952-07-23
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Granted: 1957-07-02
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Expires: 1972-07-23
Abstract
No abstract record available.
Inventors
- 👤 Daniels Joseph
- 👤 Rindtorff Ermbrecht
- 👤 Ruschmann Wilhelm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 02:54
CPC Classifications
C; C01; C01C; C01C3/00; C01C3/16; C01C3/18
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
126 words
IN THE PROCESS OF MANFACTURING A METAL CYANAMIDE, SAID METAL BEING A MEMBER OF THE GROUP CONSISTING OF THE ALKALI AND ALKALINE EARTH METALS, BY REACTION BETWEEN SAID METAL IN THE FORM OF AN OXIDE THEREOF WITH A MATERIAL SELECTED FROM THE GROUP CONSISTING OF CARBON MONOXIDE, A CARBON DIOXIDE AND MIXTURES THEREOF AND AMMONIA AT A TEMPERATURE ABOVE 600*C., THE IMPROVEMENT WHICH COMPRISES INJECTING SAID OXIDE AS A SUSPENSION IN A CARRIER GAS SELECTED FROM THE REACTANTS CONSISTING OF CARBON MONOXIDE, CARBON DIOXIDE, AND MIXTURES THEREOF, INTO A REATION CHAMBER IN A FINELY DIVIDED CONDITIONS AT A TEMPERATURE SUBSTANTIALLY ABOVE THE REACTION TEMPERATURE TO DISTRIBUTE SAID OXIDE WITHIN SAUD REACTION CHAMBER, AND SIMULTANEOUSLY INTRODUCING AMMONIA GAS INTO SAID REACTION CHAMBER AT A TEMPERATURE ABOUT 500*C.
Claim 2
Dependent Claim
126 words
IN THE PROCESS OF MANFACTURING A METAL CYANAMIDE, SAID METAL BEING A MEMBER OF THE GROUP CONSISTING OF THE ALKALI AND ALKALINE EARTH METALS, BY REACTION BETWEEN SAID METAL IN THE FORM OF AN OXIDE THEREOF WITH A MATERIAL SELECTED FROM THE GROUP CONSISTING OF CARBON MONOXIDE, A CARBON DIOXIDE AND MIXTURES THEREOF AND AMMONIA AT A TEMPERATURE ABOVE 600*C., THE IMPROVEMENT WHICH COMPRISES INJECTING SAID OXIDE AS A SUSPENSION IN A CARRIER GAS SELECTED FROM THE REACTANTS CONSISTING OF CARBON MONOXIDE, CARBON DIOXIDE, AND MIXTURES THEREOF, INTO A REATION CHAMBER IN A FINELY DIVIDED CONDITIONS AT A TEMPERATURE SUBSTANTIALLY ABOVE THE REACTION TEMPERATURE TO DISTRIBUTE SAID OXIDE WITHIN SAUD REACTION CHAMBER, AND SIMULTANEOUSLY INTRODUCING AMMONIA GAS INTO SAID REACTION CHAMBER AT A TEMPERATURE ABOUT 500*C.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-07-01 | 1960-12-31 | 1961-07-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-07-01 | 1964-12-31 | 1965-07-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-07-01 | 1968-12-31 | 1969-07-02 | $7700.00 | Window Closed / Lapsed |