US2881049A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of preparing alkali metal silicates
Assignee: Hoechst AG
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Filing: 1954-09-28
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Granted: 1959-04-07
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Expires: 1974-09-28
Abstract
No abstract record available.
Inventors
- 👤 Erbe Friedrich
- 👤 Kaufmann Waldemar
- 👤 Maikowski Michael Alexander
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 07:56
CPC Classifications
C; C01; C01B; C01B33/00; C01B33/20; C01B33/32
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
115 words
A PROCESS FOR PRODUCING HYDROUS ALKALI METAL SILICATES BY REACTION UNDER PRESSURE OF FINELY SUSPENDED SILICA WITH AN AQUEOUS ALKALI METAL HYFROXIDE SOLUTION, WHICH COMPRISES CONTINOUSLY PASSING A HOMOGENEOUS SUSPENSION OF FINELY SUSPENDED SILICA IN AN AQUEOUS ALKALI METAL HYDROXIDE SOLUTION THROUGH A PRESSURIZED REACTION ZONE HEATED TO A TEMPERATURE BETWEEN ABOUT 175* C. AND ABOUT 320* C. MAINTAINING THE WATER CONTENT CONSTANT DURING THE ENTIRE DURATION OF THE REACTION MIXTURE IN THE REACTION ZONE, SAID WATER CONTENT BEING HIGHER THAN THAT DESIRED IN THE FINAL PRODUCT, AND AFTER COMPLETION OF THE REACTION ADJUSTING THE WATER CONTENT TO THAT DESIRED INE FINAL PRODUCT BY EXPANDING THE HOT REACTION PRODUCT TO THEREBY EVAPORATE THE EXCESS WATER.
Claim 2
Dependent Claim
115 words
A PROCESS FOR PRODUCING HYDROUS ALKALI METAL SILICATES BY REACTION UNDER PRESSURE OF FINELY SUSPENDED SILICA WITH AN AQUEOUS ALKALI METAL HYFROXIDE SOLUTION, WHICH COMPRISES CONTINOUSLY PASSING A HOMOGENEOUS SUSPENSION OF FINELY SUSPENDED SILICA IN AN AQUEOUS ALKALI METAL HYDROXIDE SOLUTION THROUGH A PRESSURIZED REACTION ZONE HEATED TO A TEMPERATURE BETWEEN ABOUT 175* C. AND ABOUT 320* C. MAINTAINING THE WATER CONTENT CONSTANT DURING THE ENTIRE DURATION OF THE REACTION MIXTURE IN THE REACTION ZONE, SAID WATER CONTENT BEING HIGHER THAN THAT DESIRED IN THE FINAL PRODUCT, AND AFTER COMPLETION OF THE REACTION ADJUSTING THE WATER CONTENT TO THAT DESIRED INE FINAL PRODUCT BY EXPANDING THE HOT REACTION PRODUCT TO THEREBY EVAPORATE THE EXCESS WATER.
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) | 1962-04-06 | 1962-10-06 | 1963-04-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-04-06 | 1966-10-06 | 1967-04-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-04-06 | 1970-10-06 | 1971-04-07 | $7700.00 | Window Closed / Lapsed |