US2597889A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drying a silica-zirconia hydrogel containing an alkali salt
Assignee: HOUNDRY PROCESS Corp
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Filing: 1945-09-01
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Granted: 1952-05-27
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Expires: 1965-09-01
Abstract
No abstract record available.
Inventors
- 👤 Jr Thomas Henry Milliken
- 👤 Irving H Welinsky
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:38
CPC Classifications
B; B01; B01J; B01J21/00; B01J21/06; B01J21/066
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
68 words
THE METHOD OF PRODUCING AGGLOMERATED SILICA-ZIRCONIA GEL PIECES, WHICH COMPRISES DRYING A HYDROGEL CONTAINING SILICA AND ZIRCONIA, HAVING A PH LESS THAN 7, WHICH HYDROGEL CONTAINS ALKALI SALT IN EXCESS OF THAT PRODUCIBLE BY THE REACTION FORMING THE HYDROGEL, PURIFYING THE OBTAINED DRIED GEL OF ALKALI METAL CATIONS, PREPARING A PASTE OF THE DRIED GEL, FORMING THE PASTE INTO AGGLOMERATED PIECES, AND DRYING AND CALCINING THE FORMED PIECES.
Claim 2
Independent Claim
68 words
THE METHOD OF PRODUCING AGGLOMERATED SILICA-ZIRCONIA GEL PIECES, WHICH COMPRISES DRYING A HYDROGEL CONTAINING SILICA AND ZIRCONIA, HAVING A PH LESS THAN 7, WHICH HYDROGEL CONTAINS ALKALI SALT IN EXCESS OF THAT PRODUCIBLE BY THE REACTION FORMING THE HYDROGEL, PURIFYING THE OBTAINED DRIED GEL OF ALKALI METAL CATIONS, PREPARING A PASTE OF THE DRIED GEL, FORMING THE PASTE INTO AGGLOMERATED PIECES, AND DRYING AND CALCINING THE FORMED PIECES.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-05-27 | 1955-11-26 | 1956-05-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-05-27 | 1959-11-26 | 1960-05-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-05-27 | 1963-11-26 | 1964-05-27 | $7700.00 | Window Closed / Lapsed |