Patent US2737500A successfully refreshed from Google Patents.
US2737500A
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Process of precipitating anionic substances and precipitated compositions
Assignee: Monsanto Chemicals Ltd
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Filing: 1950-11-30
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Granted: 1956-03-06
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Expires: 1970-11-30
Abstract
No abstract record available.
Inventors
- 👤 Ralph F Nickerson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 19:00
CPC Classifications
C; C01; C01B; C01B33/00; C01B33/113; C01B33/12; C01B33/14; C01B33/141; C01B33/1415; C01B33/18; C01P; C01P2006/00; C01P2006/90
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
113 words
A PROCESS OF PRECIPITATING COLLOIDAL SILICA WHICH CONSISTS IN THE STEPS OF ADMIXING UNDER ALKALINE CONDITIONS AN ALKALINE SILICA AQUASOL AND A SUBSTANCE SELECTED FROM THE GROUP CONSISTING OF GELATIN, CASEIN AND POLYVINYL PYRIDINE, WHICH SUBSTANCE IS SOLUBLE IN NEUTRAL AND ALKALINE WATER SOLUTIONS, UNTIL A UNIFORM MIXTURE IS OBTAINED, SAID SUBSTANCE BEING EMPLOYED IN THE PROPORTION OF 1 PART BY WEIGHT THEREOF FOR EVERY 1 TO 60 PARTS BY WEIGHT OF SILICA SOLIDS IN SAID AQUASOL, ADDING A STRONG ACID IN AN AMOUNT SUFFICIENT TO CO-PRECIPITATE SAID SUBSTANCE AND THE COLLOIDAL SILICA IN SAID AQUASOL, THEREBY FORMING A PRECIPITATE WHICH SETTLES OUT OF SOLUTION, AND SEPARATING THE PRECIPITATE FROM THE LIQUID PHASE.
Claim 2
Dependent Claim
113 words
A PROCESS OF PRECIPITATING COLLOIDAL SILICA WHICH CONSISTS IN THE STEPS OF ADMIXING UNDER ALKALINE CONDITIONS AN ALKALINE SILICA AQUASOL AND A SUBSTANCE SELECTED FROM THE GROUP CONSISTING OF GELATIN, CASEIN AND POLYVINYL PYRIDINE, WHICH SUBSTANCE IS SOLUBLE IN NEUTRAL AND ALKALINE WATER SOLUTIONS, UNTIL A UNIFORM MIXTURE IS OBTAINED, SAID SUBSTANCE BEING EMPLOYED IN THE PROPORTION OF 1 PART BY WEIGHT THEREOF FOR EVERY 1 TO 60 PARTS BY WEIGHT OF SILICA SOLIDS IN SAID AQUASOL, ADDING A STRONG ACID IN AN AMOUNT SUFFICIENT TO CO-PRECIPITATE SAID SUBSTANCE AND THE COLLOIDAL SILICA IN SAID AQUASOL, THEREBY FORMING A PRECIPITATE WHICH SETTLES OUT OF SOLUTION, AND SEPARATING THE PRECIPITATE FROM THE LIQUID PHASE.
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) | 1959-03-06 | 1959-09-05 | 1960-03-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-03-06 | 1963-09-05 | 1964-03-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-03-06 | 1967-09-05 | 1968-03-06 | $7700.00 | Window Closed / Lapsed |