Patent US2699376A successfully refreshed from Google Patents.
US2699376A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for increasing the a verage pore size of a calcined silica gel
Assignee: Gulf Research and Development Co
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Filing: 1950-08-01
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Granted: 1955-01-11
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Expires: 1970-08-01
Abstract
No abstract record available.
Inventors
- 👤 Russell G Hay
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 09:01
CPC Classifications
B; B01; B01J; B01J20/00; B01J20/02; B01J20/10; B01J20/103; C; C01; C01B; C01B33/00; C01B33/113
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
75 words
A PROCESS FOR INCREASING THE AVERAGE PORE SIZE OF A SILICA GEL WHICH HAS BEEN CALCINED AT A TEMPERATURE OF ABOUT 700* TO 1300* F. COMPRISING CONTACTING THE CALCINED SILICA GEL WITH AN AQUEOUS SOLUTION OF AMMONIUM HYDROXIDE AT A TEMPERATURE BELOW ABOUT 325* F. UNTIL SUBSTANTIALLY THE DESIRED INCREASE IN THE AVERAGE SIZE OF THE PORES OF THE GEL HAS BEEN ACCOMPLISHED, AND IMMEDIATELY THEREAFTER REMOVING THE AMMONIUM HYDROXIDE FROM THE THUS TREATED GEL.
Claim 2
Dependent Claim
75 words
A PROCESS FOR INCREASING THE AVERAGE PORE SIZE OF A SILICA GEL WHICH HAS BEEN CALCINED AT A TEMPERATURE OF ABOUT 700* TO 1300* F. COMPRISING CONTACTING THE CALCINED SILICA GEL WITH AN AQUEOUS SOLUTION OF AMMONIUM HYDROXIDE AT A TEMPERATURE BELOW ABOUT 325* F. UNTIL SUBSTANTIALLY THE DESIRED INCREASE IN THE AVERAGE SIZE OF THE PORES OF THE GEL HAS BEEN ACCOMPLISHED, AND IMMEDIATELY THEREAFTER REMOVING THE AMMONIUM HYDROXIDE FROM THE THUS TREATED GEL.
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) | 1958-01-10 | 1958-07-12 | 1959-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-01-10 | 1962-07-12 | 1963-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-01-10 | 1966-07-12 | 1967-01-11 | $7700.00 | Window Closed / Lapsed |