US3112247A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Beta phase calcium pyrophosphate dentifrice abrasives and methods for their preparation
Assignee: Procter and Gamble Co
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Filing: 1962-01-26
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Granted: 1963-11-26
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Expires: 1982-01-26
Abstract
No abstract record available.
Inventors
- 👤 Henry C Schweizer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:25
CPC Classifications
C; C01; C01B; C01B25/00; C01B25/16; C01B25/26; C01B25/38; C01B25/42; A; A61; A61K; A61K8/00; A61K8/18; A61K8/19; A61K8/24; A61Q; A61Q11/00
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
95 words
THE METHOD OF PREPARING A DENTIFRICE ABRASIVE CHARACTERIZED BY A HIGH IONIC COMPATIBILITY AND LOW DENTIN ABRASION COMPRISING THE STEPS OF UNIFORMLY HEATING PREDOMINANTLY GAMMA PHASE CALCIUM PYROPHOSPHATE HAVING A DENTIN ABRASION VALUE LESS THAN ABOUT 500, TO A TEMPERATURE ABOVE 700*C. BUT NOT GREATER THAN ABOUT 900* C. FOR A TIME SUFFICIENT TO CONVERT MORE THAN 50% OF THE SAID CALCIUM PYROPHOSPHATE TO THE BETA PHAST, BUT NO LONGER THAN IS REQUIRED TO CONVERT ALL OF THE SAID CALCIUM PYROPHOSPHATE TO THE BETA PHAST AND IMMEDIATLY COOLING THE RESULTING PRODUCT TO PREVENT CRYSTALLITE GROWTH.
Claim 2
Independent Claim
95 words
THE METHOD OF PREPARING A DENTIFRICE ABRASIVE CHARACTERIZED BY A HIGH IONIC COMPATIBILITY AND LOW DENTIN ABRASION COMPRISING THE STEPS OF UNIFORMLY HEATING PREDOMINANTLY GAMMA PHASE CALCIUM PYROPHOSPHATE HAVING A DENTIN ABRASION VALUE LESS THAN ABOUT 500, TO A TEMPERATURE ABOVE 700*C. BUT NOT GREATER THAN ABOUT 900* C. FOR A TIME SUFFICIENT TO CONVERT MORE THAN 50% OF THE SAID CALCIUM PYROPHOSPHATE TO THE BETA PHAST, BUT NO LONGER THAN IS REQUIRED TO CONVERT ALL OF THE SAID CALCIUM PYROPHOSPHATE TO THE BETA PHAST AND IMMEDIATLY COOLING THE RESULTING PRODUCT TO PREVENT CRYSTALLITE GROWTH.
Claim 3
Dependent Claim
61 words
AN ABRASIVE ESPECIALLY ADAPTED TO USE IN A FLUORIDE CONTAINING DENTIFRICE COMPOSITION COMPRISING A PREDOMINANTLY BETA PHASE CALCIUM PYROPHOSPHATE HAVING A DENTIN ABRASION VALUE OF LESS THAN ABOUT 700 AND A FLUORIDE COMPATIBILITY GREATER THAN ABOUT 60%, SAID ABRASIVE BEING DERIVED BY UNIFORM HEAT TREATMENT OF A PREDOMINANTLY GAMMA PHASE CALCIUM PYROPHOSPHATE HAVING A DENTIN ABRASION VALUE OF LESS THAN 500.
Claim 4
Dependent Claim
61 words
AN ABRASIVE ESPECIALLY ADAPTED TO USE IN A FLUORIDE CONTAINING DENTIFRICE COMPOSITION COMPRISING A PREDOMINANTLY BETA PHASE CALCIUM PYROPHOSPHATE HAVING A DENTIN ABRASION VALUE OF LESS THAN ABOUT 700 AND A FLUORIDE COMPATIBILITY GREATER THAN ABOUT 60%, SAID ABRASIVE BEING DERIVED BY UNIFORM HEAT TREATMENT OF A PREDOMINANTLY GAMMA PHASE CALCIUM PYROPHOSPHATE HAVING A DENTIN ABRASION VALUE OF LESS THAN 500.
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) | 1966-11-25 | 1967-05-27 | 1967-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-11-25 | 1971-05-27 | 1971-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-11-25 | 1975-05-27 | 1975-11-26 | $7700.00 | Window Closed / Lapsed |