Patent US2659658A successfully refreshed from Google Patents.
US2659658A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of producing metal fluorides
Assignee: Pennsylvania Salt Manufacturing Co
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Filing: 1952-08-30
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Granted: 1953-11-17
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Expires: 1972-08-30
Abstract
No abstract record available.
Inventors
- 👤 Jr William A La Lande
- 👤 Mockrin Isadore
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 12:01
CPC Classifications
C; C01; C01F; C01F7/00; C01F7/48; C01F7/50; C01F7/54; C01B; C01B9/00; C01B9/08
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
69 words
THE METHOD OF MAKING METAL FLOURIDES COMPRISING PREPARING A SUBSTANTIALLY DRY MIXTURE OF AN ALKALI METAL FLUOSILICATE WITH A METAL SULFATE WHEREIN THE METAL IS A METAL OTHER THAN AN ALKALI METAL AND HEATING SAID MIXTURE TO A TEMPERATURE OF AT LEAST 200* C., BUT BELOW THAT AT WHICH THE MIXTURE MELTS, UNTIL THE REACTION IS SUBSTANTIALLY COMPLETE AS INDICATED BY SUBSTANTIALLY COMPLETE CESSATION OF EVOLUTION OF SIF4 GAS.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-11-16 | 1957-05-18 | 1957-11-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-11-16 | 1961-05-18 | 1961-11-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-11-16 | 1965-05-18 | 1965-11-17 | $7700.00 | Window Closed / Lapsed |