US2904400A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing hydrocyanic acid from formamide
Assignee: DENTSCHE GOLD und SILBER SCHEI
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Filing: 1957-04-08
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Granted: 1959-09-15
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Expires: 1977-04-08
Abstract
No abstract record available.
Inventors
- 👤 Asendorf Erich
- 👤 Bittner Friedrich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:45
CPC Classifications
C; C01; C01C; C01C3/00; C01C3/02; C01C3/0204
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
86 words
IN A METHOD FOR THE CONTINUOUS PRODUCTION OF HYDROCYANIC ACID BY THE DECOMPOSITION OF FORMAMIDE ON CATALYTICALLY ACTIVE SURFACES AT ELEVATED TEMPERATURES BYTWEEN 340* C. AND 140* C., THE STEP WHICH COMPRISES PASSING FORMAMIDE VAPORS THROUGH A CATALYTIC DECOMPOSITION CHAMBER HAVING CATALYTICALLY AVTIVE INNER SURFACES HEATED TO TEMPERATURES BETWEEN 340* C, AND 410* C., THE FREE INNER CROSS-SECTION OF WHICH INCREASES FROM INLET END TO OUTLET END AND THE AREA OF THE CATALYTICALLY ACTIVE INNER SURFACES OF WHICH ALSO INCREASES FROM INLET END TO OUTLET END.
Claim 2
Dependent Claim
86 words
IN A METHOD FOR THE CONTINUOUS PRODUCTION OF HYDROCYANIC ACID BY THE DECOMPOSITION OF FORMAMIDE ON CATALYTICALLY ACTIVE SURFACES AT ELEVATED TEMPERATURES BYTWEEN 340* C. AND 140* C., THE STEP WHICH COMPRISES PASSING FORMAMIDE VAPORS THROUGH A CATALYTIC DECOMPOSITION CHAMBER HAVING CATALYTICALLY AVTIVE INNER SURFACES HEATED TO TEMPERATURES BETWEEN 340* C, AND 410* C., THE FREE INNER CROSS-SECTION OF WHICH INCREASES FROM INLET END TO OUTLET END AND THE AREA OF THE CATALYTICALLY ACTIVE INNER SURFACES OF WHICH ALSO INCREASES FROM INLET END TO OUTLET END.
References Cited (Backward Citations)
US1605647A
Cited
US1675366A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-09-14 | 1963-03-16 | 1963-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-09-14 | 1967-03-16 | 1967-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-09-14 | 1971-03-16 | 1971-09-15 | $7700.00 | Window Closed / Lapsed |