US3816600A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of manufacturing metal fluorides and metal fluoride mixtures which do not comprise oxygen
Assignee: US Philips Corp
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Filing: 1971-09-24
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Granted: 1974-06-11
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Expires: 1991-09-24
Abstract
Abstract MANUFACUTRE OF METAL FLUORIDES WHICH CONTAIN LESS THAN 0.01% BY WEIGHT OF OXYGEN. THE METAL FLUORIDES TO BE PURIFIED ARE TREATED IN A MOLTEN STATE IN AN INERT ATMOSPHERE WITH AMMONIUM FLUORIDE AND/OR AMMONIUM BIFLUORIDE.
Inventors
- 👤 A Huizing
- 👤 J Schroder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 03:46
CPC Classifications
C; C01; C01D; C01D15/00; C01D15/04; C01B; C01B9/00; C01B9/08; C01C; C01C1/00; C01C1/16; C01C1/162; C01D3/00; C01D3/02
Claims Analysis
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References Cited (Backward Citations)
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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) | 1977-06-10 | 1977-12-10 | 1978-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-10 | 1981-12-10 | 1982-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-10 | 1985-12-10 | 1986-06-11 | $7700.00 | Window Closed / Lapsed |