Patent US3037128A successfully refreshed from Google Patents.
US3379541A
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Alkaline earth metal hydroxylapatites, processes for preparing the same and compositions containing the same
Assignee: Monsanto Co
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Filing: 1964-02-18
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Granted: 1968-04-23
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Expires: 1984-02-18
Abstract
No abstract record available.
Inventors
- 👤 Melvin E Tuvell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:27
CPC Classifications
C; C01; C01B; C01B25/00; C01B25/16; C01B25/26; C01B25/32; C01B25/34; B; B22; B22C; B22C3/00; C01B25/322
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
145 words
A PROCESS FOR PREPARING AN ALKALINE EARTH METAL HYDROXYLAPATITE HAVING AN ALKALINE EARTH METAL OXIDE TO PHOSPHORUS PENTOXIDE MOLAR RATIO OF BETWEEN ABOUT 3.27:1 TO ABOUT 3.37:1 AND EXHIBITING IMPROVED MOLD DRESSING PROPERTIES WHEN DISPERSED IN WATER WHICH COMPRISES REACTING IN SUBSTANTIALLY STOICHIOMETRIC AMOUNTS A PHOSPHORIC ACID AND AN ALKALINE EARTH METAL SOURCE SELECTED FROM THE GROUP CONSISTING OF INORGANIC ALKALINE EARTH METAL SALTS, OXIDES, HYDROXIDES AND MIXTURES THEREOF CONTINING MOIETIES CAPABLE FO BEING REMOVED AS GASES UNDER THE CONDITONS SPECIFIED HEREIN IN AN AQUEOUS MEDIUM OF FROM ABOUT 30% TO ABOUT 95% BY WEIGHT OF THE TOTAL REACTION MIXTURE UNDER INTENSE HIGH SHEAR AGTATION TO PRODUCE AN INTERMEDIATE REACTION PRODUCT HAVING A GEOMETRIC WEIGHT MEAN PARTICLE DIAMETER OF LESS THAN 10 MICRONS, AND THEREAFTER CALCINING SAID REACTION PRODUCT AT PRODUCT TEMPERATURE FROM ABOUT 700 TO 1100*C. FOR A TIME SUFFICIENT TO PRODUCE SAID HYDROXYLAPATITE.
Claim 2
Dependent Claim
145 words
A PROCESS FOR PREPARING AN ALKALINE EARTH METAL HYDROXYLAPATITE HAVING AN ALKALINE EARTH METAL OXIDE TO PHOSPHORUS PENTOXIDE MOLAR RATIO OF BETWEEN ABOUT 3.27:1 TO ABOUT 3.37:1 AND EXHIBITING IMPROVED MOLD DRESSING PROPERTIES WHEN DISPERSED IN WATER WHICH COMPRISES REACTING IN SUBSTANTIALLY STOICHIOMETRIC AMOUNTS A PHOSPHORIC ACID AND AN ALKALINE EARTH METAL SOURCE SELECTED FROM THE GROUP CONSISTING OF INORGANIC ALKALINE EARTH METAL SALTS, OXIDES, HYDROXIDES AND MIXTURES THEREOF CONTINING MOIETIES CAPABLE FO BEING REMOVED AS GASES UNDER THE CONDITONS SPECIFIED HEREIN IN AN AQUEOUS MEDIUM OF FROM ABOUT 30% TO ABOUT 95% BY WEIGHT OF THE TOTAL REACTION MIXTURE UNDER INTENSE HIGH SHEAR AGTATION TO PRODUCE AN INTERMEDIATE REACTION PRODUCT HAVING A GEOMETRIC WEIGHT MEAN PARTICLE DIAMETER OF LESS THAN 10 MICRONS, AND THEREAFTER CALCINING SAID REACTION PRODUCT AT PRODUCT TEMPERATURE FROM ABOUT 700 TO 1100*C. FOR A TIME SUFFICIENT TO PRODUCE SAID HYDROXYLAPATITE.
Claim 3
Dependent Claim
87 words
AN IMPROVED ALKALINE EARTH METAL HYDROXYLAPATITE EXHIBITING WHEN USED AS A MOLD DRESSING IMPROVED COATING QUALITY, SAID HYDROXYLAPATITE CHARACTERIZED BY HAVING AN ALKALINE EARTH METAL OXIDE TO PHOSPHORUS PENTOXIDE MOLAR RATIO OF FROM ABOUT 3.27:1 TO 3.37:1, A TOTAL IGNITION LOSS OF TREATMENT AT 800*C. FOR ONE HOUR OF LESS THAN ABOUT 1.1 WEIGHT PERCENT, AND A GEOMETRIC WEIGHT MEAN PARTICLE DIAMETER OF FROM ABOUT 1 TO 10 MICRONS WITH ABOUT 80 WEIGHT PERCENT HAVING A PARTICLE DIAMETER OF FROM ABOUT 1 MICRON TO ABOUT 16 MICRONS.
Claim 4
Dependent Claim
87 words
AN IMPROVED ALKALINE EARTH METAL HYDROXYLAPATITE EXHIBITING WHEN USED AS A MOLD DRESSING IMPROVED COATING QUALITY, SAID HYDROXYLAPATITE CHARACTERIZED BY HAVING AN ALKALINE EARTH METAL OXIDE TO PHOSPHORUS PENTOXIDE MOLAR RATIO OF FROM ABOUT 3.27:1 TO 3.37:1, A TOTAL IGNITION LOSS OF TREATMENT AT 800*C. FOR ONE HOUR OF LESS THAN ABOUT 1.1 WEIGHT PERCENT, AND A GEOMETRIC WEIGHT MEAN PARTICLE DIAMETER OF FROM ABOUT 1 TO 10 MICRONS WITH ABOUT 80 WEIGHT PERCENT HAVING A PARTICLE DIAMETER OF FROM ABOUT 1 MICRON TO ABOUT 16 MICRONS.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-04-23 | 1971-10-23 | 1972-04-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-04-23 | 1975-10-23 | 1976-04-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-04-23 | 1979-10-23 | 1980-04-23 | $7700.00 | Window Closed / Lapsed |