US3771259A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the manufacture of calcium carbide of predetermined quality
Assignee: Knapsack AG
•
Filing: 1970-07-08
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Granted: 1973-11-13
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Expires: 1990-07-08
Abstract
Abstract Production of calcium carbide of low gas yield from calcium carbide of higher gas yield. Calcium oxide having a particle size of between 1 and 8 mm is introduced,preferably during tapping, into the melt of such calcium carbide of higher gas yield.
Inventors
- 👤 W Portz
- 👤 G Rittershausen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 01:48
CPC Classifications
C; C01; C01B; C01B32/00; C01B32/90; C01B32/914; C01B32/942
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
22 words
The process as claimed in claim 1, wherein the calcium oxide is added to the jet of molten carbide produced on tapping.
Claim 2
Dependent Claim
41 words
The process as claimed in claim 1 wherein the calcium oxide is introduced in combination with at least one inorganic compound selected from fluor spar and aluminum oxide, with a particle size substantially the same as that of the calcium oxide.
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) | 1976-11-12 | 1977-05-14 | 1977-11-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-12 | 1981-05-14 | 1981-11-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-12 | 1985-05-14 | 1985-11-13 | $7700.00 | Window Closed / Lapsed |