US3039848A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of preparing metal cyanamides
Assignee: Wyeth Holdings LLC
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Filing: 1959-10-23
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Granted: 1962-06-19
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Expires: 1979-10-23
Abstract
No abstract record available.
Inventors
- 👤 Orland O Schaus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 19:42
CPC Classifications
C; C01; C01C; C01C3/00; C01C3/16; C01C3/18
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
168 words
A METHOD OF PREPARING CALCIUM CYANAMIDE WHICH COMPRISES ESTABLISHING A BED CONSISTING ESSENTIALLY OF PARTICULATES SELECTED FROM THE GROUP CONSISTING OF CALCIUM CARBONATE, CALCIUM OXIDE, AND MIXTURES THEREOF, AND HAVING AN AVERAGE PARTICLE SIZE IN THE RANGE OF 5 TO 60 TYLER MESH, MAINTAINING SAID BED UNDER FLUIDIZED CONDITIONS BY PASSING UPWARDLY THERETHROUGH SUFFICIENT OF A GASEOUS MIXTURE CONSISTING ESSENTIALLY OF AMMONIA AND AN AUXILIARY GAS SELECTED FROM THE GROUP CONSISTING OF CARBON DIOXIDE, NITROGEN AND MIXTURES THEREOF, THE AUXILIARY GAS BEING AT A TEMPERATURE OF AT LEAST ABOUT 1700*F. JUST PRIOR TO CONTACTING THE BED PARTICULATES, MAINTAINING A BED TEMPERATURE OF AT LEAST ABOUT 1400*F., SAID AUXILIARY GAS PROVIDING SUBSTANTIALLY ALL THE HEAT OF REACTION, AND WHEN MORE THAN A RELATIVELY SMALL AMOUNT OF THE BED IS MADE UP OF CALCIUM OXIDE, SUFFICIENT CARBON DIOXIDE IS EMPLOYED AS A SOURCE OF CARBON FOR THE FORMATION OF CALCIUM CYANAMIDE, REMOVING THE RESULTING GASEOUS EFFLUENT FROM SAID BED SUBSTANTIALLY AS FORMED AND RECOVERING PRODUCT CALCIUM CYANAMIDE FROM SAID BED.
Claim 2
Independent Claim
168 words
A METHOD OF PREPARING CALCIUM CYANAMIDE WHICH COMPRISES ESTABLISHING A BED CONSISTING ESSENTIALLY OF PARTICULATES SELECTED FROM THE GROUP CONSISTING OF CALCIUM CARBONATE, CALCIUM OXIDE, AND MIXTURES THEREOF, AND HAVING AN AVERAGE PARTICLE SIZE IN THE RANGE OF 5 TO 60 TYLER MESH, MAINTAINING SAID BED UNDER FLUIDIZED CONDITIONS BY PASSING UPWARDLY THERETHROUGH SUFFICIENT OF A GASEOUS MIXTURE CONSISTING ESSENTIALLY OF AMMONIA AND AN AUXILIARY GAS SELECTED FROM THE GROUP CONSISTING OF CARBON DIOXIDE, NITROGEN AND MIXTURES THEREOF, THE AUXILIARY GAS BEING AT A TEMPERATURE OF AT LEAST ABOUT 1700*F. JUST PRIOR TO CONTACTING THE BED PARTICULATES, MAINTAINING A BED TEMPERATURE OF AT LEAST ABOUT 1400*F., SAID AUXILIARY GAS PROVIDING SUBSTANTIALLY ALL THE HEAT OF REACTION, AND WHEN MORE THAN A RELATIVELY SMALL AMOUNT OF THE BED IS MADE UP OF CALCIUM OXIDE, SUFFICIENT CARBON DIOXIDE IS EMPLOYED AS A SOURCE OF CARBON FOR THE FORMATION OF CALCIUM CYANAMIDE, REMOVING THE RESULTING GASEOUS EFFLUENT FROM SAID BED SUBSTANTIALLY AS FORMED AND RECOVERING PRODUCT CALCIUM CYANAMIDE FROM SAID BED.
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) | 1965-06-18 | 1965-12-18 | 1966-06-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-06-18 | 1969-12-18 | 1970-06-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-06-18 | 1973-12-18 | 1974-06-19 | $7700.00 | Window Closed / Lapsed |