Patent US2741877A successfully refreshed from Google Patents.
US2741877A
Expired / Lapsed
US
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Method of producing synthetic mica
Assignee: EIDP Inc
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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 13:43
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.
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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) | 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 |