US2829981A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Surface modified silica gels
Assignee: Individual
•
Filing: 1954-01-29
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Granted: 1958-04-08
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Expires: 1974-01-29
Abstract
No abstract record available.
Inventors
- 👤 Shapiro Isadore
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 03:25
CPC Classifications
C; C01; C01B; C01B33/00; C01B33/113; B; B01; B01J; B01J13/00; B01J13/0052; B01J13/0069; B01J20/00; B01J20/02; B01J20/0203; B01J20/0248; B01J20/04; B01J20/041; B01J20/06; B01J20/08; B01J20/10; B01J20/103; B01J20/30; B01J20/32; B01J20/3202; B01J20/3204; B01J20/3231; B01J20/3234; B01J20/3236; C01B35/00; C01B35/02; C01B35/026; C01B6/00
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
88 words
THE PROCESS FOR PRODUCING SURFACE MODIFIED OXIDES OF THE CLASS CONSISTING OF AT LEAST OF SILICA, ALUMINA, AND MAGNESIA GELS WHICH COMPRISES TREATING THE GEL TO REMOVE ALL ADSORBED WATER, THEREAFTER CONTACTING THE GEL CONTAINING ONLY BOUND WATER WITH GASEOUS DIBORANE IN AN AMOUNT AND FOR A TIME SUFFICIENT TO REPLACE HYDROGEN ATOMS OF HYDROXYL GROUPS OF THE ORIGINAL GEL STRUCTURE BY -BH2 RADICALS, AND THEN HEATING THE SURFACE MODIFIED OXIDE TO EFFECT FURTHER HYDROLYSIS TO CONVERT AT LEAST A PORTION OF THE -BH2 RADICALS TO -B(OH)2 RADICALS.
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) | 1961-04-07 | 1961-10-07 | 1962-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-04-07 | 1965-10-07 | 1966-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-04-07 | 1969-10-07 | 1970-04-08 | $7700.00 | Window Closed / Lapsed |