US2853454A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Treatment of silica gel
Assignee: Sunoco Inc
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Filing: 1953-07-22
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Granted: 1958-09-23
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Expires: 1973-07-22
Abstract
No abstract record available.
Inventors
- 👤 Ivor W Mills
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 02:16
CPC Classifications
B; B01; B01J; B01J20/00; B01J20/02; B01J20/10; B01J20/103
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
107 words
IN A SELECTIVE ADSORPTION METHOD WHEREIN SILICA GEL IS CONTACTED WITH ORGANIC MATERIAL TO EFFECT ADSORPTION OF AT LEAST ONE COMPONENT THEREOF AND IS SUBSEQUENTLY HEATED ABOVE 400*F. TO REMOVE ORGANIC CONTAMINANTS THEREFROM, THE IMPROVEMENT WHICH COMPRISES CONTACTING THE RESULTING SILICA GEL WITH WATER IN LIQUID PHASE CONTAINING 0 TO 45 PERCENT BY WEIGHT OF HYDROGEN CHLORIDE AT A TREATING TEMPERATURE BELOW 400*F. FOR A PERIOD OF AT LEAST HALF AN HOUR, AND SUBSEQUENTLY HEATING SAID SILICA GEL UNDER VACUUM TO A TEMPERATURE BELOW 400*F. TO REMOVE WATER OTHER THAN STRUCTURALLY COMBINED WATER, THEREBY TO INCREASE THE ACTIVITY OF SAID SILICA GEL FOR FURTHER USE AS ADSORBENT.
Claim 2
Dependent Claim
107 words
IN A SELECTIVE ADSORPTION METHOD WHEREIN SILICA GEL IS CONTACTED WITH ORGANIC MATERIAL TO EFFECT ADSORPTION OF AT LEAST ONE COMPONENT THEREOF AND IS SUBSEQUENTLY HEATED ABOVE 400*F. TO REMOVE ORGANIC CONTAMINANTS THEREFROM, THE IMPROVEMENT WHICH COMPRISES CONTACTING THE RESULTING SILICA GEL WITH WATER IN LIQUID PHASE CONTAINING 0 TO 45 PERCENT BY WEIGHT OF HYDROGEN CHLORIDE AT A TREATING TEMPERATURE BELOW 400*F. FOR A PERIOD OF AT LEAST HALF AN HOUR, AND SUBSEQUENTLY HEATING SAID SILICA GEL UNDER VACUUM TO A TEMPERATURE BELOW 400*F. TO REMOVE WATER OTHER THAN STRUCTURALLY COMBINED WATER, THEREBY TO INCREASE THE ACTIVITY OF SAID SILICA GEL FOR FURTHER USE AS ADSORBENT.
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) | 1961-09-22 | 1962-03-24 | 1962-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-09-22 | 1966-03-24 | 1966-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-09-22 | 1970-03-24 | 1970-09-23 | $7700.00 | Window Closed / Lapsed |