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Patent US3285859A successfully refreshed from Google Patents.
US3285859A
Expired / Lapsed
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Alkali metal silicates and method for producing the same
Assignee: Cowles Chemical Co
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Filing: 1963-03-25
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Granted: 1966-11-15
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Expires: 1983-03-25
Abstract
No abstract record available.
Inventors
- 👤 Frederic C Jelen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 12:51
CPC Classifications
C; C01; C01B; C01B33/00; C01B33/20; C01B33/32; C01B33/325
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
111 words
IN THE MANUFACTURE OF DUST-FREE, SUBSTANTIALLY SPHERICAL PARTICLES OF HYDRATED ALKALI METAL SILICATES OF SUBSTANTIALLY UNIFORM SIZE, THE STEPS OF CRYSTALLIZING PARTICLES OF A HYDRATED ALKALI METAL SILICATE, FEEDING SAID ALAKALI METAL SILICATE CRYSTAL TO A MIXER, THEN ADDING ONE PART OF A MOLTEN ALKALI METAL SILICATE HYDRATE TO AT LEAST THREE PARTS OF SOLID CRYSTALLINE HYDRATED ALKALI METAL SILICATE HYDRATE, OF A SIZE SMALLER THAN THE DESIRED PRODUCT, WITH GOOD MECHANICAL AGITATION, WHILE MAINTAINING THE TEMPERATURE OF THE MIX AT CRYSTALLIZING TEMPERATURE, SCREENING THE RESULTANT DUST-FREE SPHERICAL PARTICLES, AND WITHDRAWING THE PRODUCT, WHILE FEEDING IN AN AMOUNT OF ALKALI METAL SILICATE HYDRATE EQUAL TO THE AMOUNT OF FINAL PRODUCT WITHDRAWN.
Claim 2
Dependent Claim
111 words
IN THE MANUFACTURE OF DUST-FREE, SUBSTANTIALLY SPHERICAL PARTICLES OF HYDRATED ALKALI METAL SILICATES OF SUBSTANTIALLY UNIFORM SIZE, THE STEPS OF CRYSTALLIZING PARTICLES OF A HYDRATED ALKALI METAL SILICATE, FEEDING SAID ALAKALI METAL SILICATE CRYSTAL TO A MIXER, THEN ADDING ONE PART OF A MOLTEN ALKALI METAL SILICATE HYDRATE TO AT LEAST THREE PARTS OF SOLID CRYSTALLINE HYDRATED ALKALI METAL SILICATE HYDRATE, OF A SIZE SMALLER THAN THE DESIRED PRODUCT, WITH GOOD MECHANICAL AGITATION, WHILE MAINTAINING THE TEMPERATURE OF THE MIX AT CRYSTALLIZING TEMPERATURE, SCREENING THE RESULTANT DUST-FREE SPHERICAL PARTICLES, AND WITHDRAWING THE PRODUCT, WHILE FEEDING IN AN AMOUNT OF ALKALI METAL SILICATE HYDRATE EQUAL TO THE AMOUNT OF FINAL PRODUCT WITHDRAWN.
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) | 1969-11-14 | 1970-05-16 | 1970-11-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-11-14 | 1974-05-16 | 1974-11-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-11-14 | 1978-05-16 | 1978-11-15 | $7700.00 | Window Closed / Lapsed |