US2741877A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing synthetic mica
Assignee: EIDP Inc
•
Filing: 1952-02-23
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Granted: 1956-04-17
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Expires: 1972-02-23
Abstract
No abstract record available.
Inventors
- 👤 Frank J Dobrovolny
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 08:28
CPC Classifications
C; C01; C01B; C01B33/00; C01B33/20; C01B33/36; C01B33/38; C01B33/42; C30; C30B; C30B11/00; C30B29/00; C30B29/10; C30B29/34
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
84 words
THE PROCESS FOR THE PRODUCTION OF A SYNTHETIC MICA AS A CONTINUOUS LAMELLAR CRYSTAL SHEET WHICH COMPRISES FLOWING MOLTEN MICA IN A THIN STREAM INTO A CRYSTALLIZING ZONE, COOLING THE THIN STREAM TO CAUSE CRYSTALLIZATION AND AT SUCH A RATE THAT A TEMPERATURE DIFFERENCE OF UPWARDS OF 20* C. BE MAINTAINED BETWEEN THE SOLID CRYSTAL FORMED IN SAID CRYSTALLIZING ZONE AND THE SAID THIN STREAM AT THE LIQUID-CRYSTAL INTERFACE AND WITHDRAWING THE MICA SHEET THUS FORMED SUBSTANTIALLY AS RAPIDLY AS FORMED FROM SAID ZONE.
Claim 2
Dependent Claim
84 words
THE PROCESS FOR THE PRODUCTION OF A SYNTHETIC MICA AS A CONTINUOUS LAMELLAR CRYSTAL SHEET WHICH COMPRISES FLOWING MOLTEN MICA IN A THIN STREAM INTO A CRYSTALLIZING ZONE, COOLING THE THIN STREAM TO CAUSE CRYSTALLIZATION AND AT SUCH A RATE THAT A TEMPERATURE DIFFERENCE OF UPWARDS OF 20* C. BE MAINTAINED BETWEEN THE SOLID CRYSTAL FORMED IN SAID CRYSTALLIZING ZONE AND THE SAID THIN STREAM AT THE LIQUID-CRYSTAL INTERFACE AND WITHDRAWING THE MICA SHEET THUS FORMED SUBSTANTIALLY AS RAPIDLY AS FORMED FROM SAID ZONE.
References Cited (Backward Citations)
US789911A
Cited
US885934A
Cited
US1944848A
Cited
US2041448A
Cited
DE735360C
Cited
US2185280A
Cited
US2363323A
Cited
US2509845A
Cited
US2549880A
Cited
US2645060A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-04-17 | 1959-10-17 | 1960-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-04-17 | 1963-10-17 | 1964-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-04-17 | 1967-10-17 | 1968-04-17 | $7700.00 | Window Closed / Lapsed |