US3598751A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing bivalent metal halophosphate compounds and products obtained thereby
Assignee: Mallinckrodt Chemical Works
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Filing: 1970-02-09
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Granted: 1971-08-10
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Expires: 1990-02-09
Abstract
Abstract ACTIVATED BIVALENT METAL HALOPHOSPHATE COMPOUNDS HAVING THE APATITE CRYSTAL STRUCTURE ARE PREPARED BY COPRECIPITATION. TWO OR MORE TOTAL SOLUTIONS, THE SUM OF WHICH CONTAIN ALL THE IONS NEEDED IN THE FINAL PRODUCT, ARE MIXED IN APPROXIMATELY STOICHIOMETRIC PROPORTIONS. A BRIEF FIRING CONVERTS THIS INTERMEDIATE INTO A HALOPHOSPHATE PHOSPHOR OF THE APATITE TYPE.
Inventors
- 👤 Daniel J Frese
- 👤 Ronald S Schreiber
- 👤 Hugh C Bertsch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:14
CPC Classifications
C; C01; C01B; C01B25/00; C01B25/16; C01B25/26; C01B25/455; C09; C09K; C09K11/00; C09K11/08; C09K11/74; C09K11/75; C09K11/76
Claims Analysis
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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) | 1974-08-09 | 1975-02-08 | 1975-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-09 | 1979-02-08 | 1979-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-09 | 1983-02-08 | 1983-08-10 | $7700.00 | Window Closed / Lapsed |