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Patent US3387925A successfully refreshed from Google Patents.
US3387925A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymer suspension stabilizer
Assignee: Stauffer Chemical Co
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Filing: 1966-03-16
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Granted: 1968-06-11
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Expires: 1986-03-16
Abstract
No abstract record available.
Inventors
- 👤 Reginald E Vanstrom
- 👤 Jr Fred Mccollough
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:48
CPC Classifications
C; C01; C01B; C01B25/00; C01B25/16; C01B25/26; C01B25/32; C01B25/322; C08; C08F; C08F2/00; C08F2/12; C08F2/16; C08F2/18
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
80 words
A PROCESS FOR PREPARING TRICALCIUM PHOSPHATE HAVING A PARTICLE SIZE SUFFICIENT FOR SUSPENSION POLYMERIZATION COMPRISING RAPIDLY ADDING DILUTE AQUEOUS ORTHOPHOSPHORIC ACID TO A VIGOROUSLY AGITATED HYDRATED LIME SLURRY FOR A PERIOD OF TIME OF BETWEEN ABOUT 20 AND ABOUT 66 MINUTES, IN AN AMOUNT SUFFICIENT TO ADJUST THE FINAL PH OF THE REACTION MIXTURE TO BETWEEN ABOUT 6.7 AND 8.5, WHILE MAINTAINING THE TEMPERATURE OF THE REACTION MIXTURE BETWEEN ABOUT 20*C. AND 50*C., AND RECOVERING THE PRECIPITATED WET FILTER CAKE.
Claim 2
Dependent Claim
80 words
A PROCESS FOR PREPARING TRICALCIUM PHOSPHATE HAVING A PARTICLE SIZE SUFFICIENT FOR SUSPENSION POLYMERIZATION COMPRISING RAPIDLY ADDING DILUTE AQUEOUS ORTHOPHOSPHORIC ACID TO A VIGOROUSLY AGITATED HYDRATED LIME SLURRY FOR A PERIOD OF TIME OF BETWEEN ABOUT 20 AND ABOUT 66 MINUTES, IN AN AMOUNT SUFFICIENT TO ADJUST THE FINAL PH OF THE REACTION MIXTURE TO BETWEEN ABOUT 6.7 AND 8.5, WHILE MAINTAINING THE TEMPERATURE OF THE REACTION MIXTURE BETWEEN ABOUT 20*C. AND 50*C., AND RECOVERING THE PRECIPITATED WET FILTER CAKE.
References Cited (Backward Citations)
US2095994A
Cited
US2673194A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-06-11 | 1971-12-11 | 1972-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-06-11 | 1975-12-11 | 1976-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-06-11 | 1979-12-11 | 1980-06-11 | $7700.00 | Window Closed / Lapsed |