US2946656A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dibasic alkaline earth metal phosphate and luminescent powders containing such phosphate
Assignee: Umicore NV SA
•
Filing: 1956-02-21
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Granted: 1960-07-26
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Expires: 1976-02-21
Abstract
No abstract record available.
Inventors
- 👤 Willy Schreurs
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:47
CPC Classifications
C; C01; C01B; C01B25/00; C01B25/16; C01B25/26; C01B25/265; C01B25/32; C01B25/325; C09; C09K; C09K11/00; C09K11/08; C09K11/70; C09K11/71
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
80 words
THE PROCESS FOR THE MANUFACTURE OF DICALCIUM PHOSPHATE BY PRECIPITATION FROM AN AQUEOUSU MEDIUM WHICH COMPRISES SLOWLY INTRODUCING AN AQUEOUS SOLUTION OF A PURE CALCIUM CHLORIDE INTO AN AQUEOUS SOLUTION OF PURE AMMONIUM PHOSPHATE AND, SIMULTANEOUSLY WITH THE INTRODUCTION OF SAID AQUEOUS SOLUTION OF SAID CALCIUM CHLORIDE, CONTINUOUSLY ADDING GASEOUS AMMONIA TO THE AQUEOUS MEDIUM IN A QUANTITY TO MAINTAIN THE PH OF THE AQUEOUS MEDIUM AT 5.0 TO 5.1 UNTIL THE COMPLETION OF THE PRECIPITATION OF SAID DICALCIUM PHOSPHATE.
Claim 2
Dependent Claim
80 words
THE PROCESS FOR THE MANUFACTURE OF DICALCIUM PHOSPHATE BY PRECIPITATION FROM AN AQUEOUSU MEDIUM WHICH COMPRISES SLOWLY INTRODUCING AN AQUEOUS SOLUTION OF A PURE CALCIUM CHLORIDE INTO AN AQUEOUS SOLUTION OF PURE AMMONIUM PHOSPHATE AND, SIMULTANEOUSLY WITH THE INTRODUCTION OF SAID AQUEOUS SOLUTION OF SAID CALCIUM CHLORIDE, CONTINUOUSLY ADDING GASEOUS AMMONIA TO THE AQUEOUS MEDIUM IN A QUANTITY TO MAINTAIN THE PH OF THE AQUEOUS MEDIUM AT 5.0 TO 5.1 UNTIL THE COMPLETION OF THE PRECIPITATION OF SAID DICALCIUM PHOSPHATE.
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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) | 1963-07-26 | 1964-01-25 | 1964-07-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-07-26 | 1968-01-25 | 1968-07-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-07-26 | 1972-01-25 | 1972-07-26 | $7700.00 | Window Closed / Lapsed |