Patent US3683493A successfully refreshed from Google Patents.
Patent US2840456A successfully refreshed from Google Patents.
US2840456A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for making alkali metal silicates
Assignee: Diamond Shamrock Corp
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Filing: 1954-01-04
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Granted: 1958-06-24
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Expires: 1974-01-04
Abstract
No abstract record available.
Inventors
- 👤 Jr William T Gooding
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 10:18
CPC Classifications
C; C01; C01B; C01B33/00; C01B33/20; C01B33/32; C08; C08K; C08K5/00; C08K5/36; C08K5/37
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
148 words
A PROCESS FOR FORMING CRYSTALLINE, SODIUM SILICATE NONCAKING IN A MOIST ATMOSPHERE, HAVING A MELTING POINT OF THE ORDER OF 2000*F., AND HAVING AN NA2O:SIO2 RATIO WITHIN THE RANGE FROM APPROXIMATELY 1.65:1 TO 2.25:1 COMPRISING MIXING A SODIUM HYDROXIDE SOLUTION HAVING A CONCENTRATION WITHIN THE RANGE FROM ABOUT 55 TO ABOUT 74% NAOH WITH A SODIUM SILICATE SOLUTION HAVING AN NA2O:SIO2 RATIO WITHIN THE RANGE FROM APPROXIMATELY 1:1 TO 1:3.4, THE SODIUM SILICATE AND SODIUM HYDROXIDE BEING IN QUANTITIES CALCULATED TO PRODUCE A REACTION MIXTURE HAVING AN NA2O:SIO2 RATIO OF AT LEAST ABOUT 3:1, HEATING SAID MIXTURE TO AT LEAST ABOUT 90*C., COOLING THE MIXTURE TO A TEMPERATURE WITHIN THE RANGE FROM ABOUT 65 TO ABOUT 90*C. AND HOLDING THE MIXTURE AT A TEMPERATURE WITHIN SAID RANGE UNTIL CRYSTALLIZATION IS SUBSTANTIALLY COMPLETE, SEPARATING THE CRYSTALS OF HIGH MELTING POINT SODIUM SILICATE FROM THE MIXTURE, AND HEATDRYING THE SAME.
Claim 2
Dependent Claim
148 words
A PROCESS FOR FORMING CRYSTALLINE, SODIUM SILICATE NONCAKING IN A MOIST ATMOSPHERE, HAVING A MELTING POINT OF THE ORDER OF 2000*F., AND HAVING AN NA2O:SIO2 RATIO WITHIN THE RANGE FROM APPROXIMATELY 1.65:1 TO 2.25:1 COMPRISING MIXING A SODIUM HYDROXIDE SOLUTION HAVING A CONCENTRATION WITHIN THE RANGE FROM ABOUT 55 TO ABOUT 74% NAOH WITH A SODIUM SILICATE SOLUTION HAVING AN NA2O:SIO2 RATIO WITHIN THE RANGE FROM APPROXIMATELY 1:1 TO 1:3.4, THE SODIUM SILICATE AND SODIUM HYDROXIDE BEING IN QUANTITIES CALCULATED TO PRODUCE A REACTION MIXTURE HAVING AN NA2O:SIO2 RATIO OF AT LEAST ABOUT 3:1, HEATING SAID MIXTURE TO AT LEAST ABOUT 90*C., COOLING THE MIXTURE TO A TEMPERATURE WITHIN THE RANGE FROM ABOUT 65 TO ABOUT 90*C. AND HOLDING THE MIXTURE AT A TEMPERATURE WITHIN SAID RANGE UNTIL CRYSTALLIZATION IS SUBSTANTIALLY COMPLETE, SEPARATING THE CRYSTALS OF HIGH MELTING POINT SODIUM SILICATE FROM THE MIXTURE, AND HEATDRYING THE SAME.
Claim 3
Dependent Claim
52 words
A CRYSTALLINE ALKALI METAL SILICATE NONCAKING IN A MOIST ATMOSPHERE, HAVING A MELTING POINT OF THE ORDER OF 2000*F., AND HAVING AN ALKALI METAL OXIDE:SILICON DIOXIDE RATIO WITHIN THE RANGE FROM APPROXIMATELY 1.65:1 TO 2.25:1, SAID SILICATE HAVING AN X-RAY DIFFRACTION PATTERN CHARACTERISTIC OF ALKALI METAL SESQUISILICATE AND ASSOCIATED ALKALI METAL HYDROXIDE.
Claim 4
Dependent Claim
52 words
A CRYSTALLINE ALKALI METAL SILICATE NONCAKING IN A MOIST ATMOSPHERE, HAVING A MELTING POINT OF THE ORDER OF 2000*F., AND HAVING AN ALKALI METAL OXIDE:SILICON DIOXIDE RATIO WITHIN THE RANGE FROM APPROXIMATELY 1.65:1 TO 2.25:1, SAID SILICATE HAVING AN X-RAY DIFFRACTION PATTERN CHARACTERISTIC OF ALKALI METAL SESQUISILICATE AND ASSOCIATED ALKALI METAL HYDROXIDE.
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) | 1961-06-23 | 1961-12-23 | 1962-06-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-23 | 1965-12-23 | 1966-06-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-23 | 1969-12-23 | 1970-06-24 | $7700.00 | Window Closed / Lapsed |