US2978298A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing hydrophobic aerogels
Assignee: General Electric Co
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Filing: 1956-09-04
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Granted: 1961-04-04
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Expires: 1976-09-04
Abstract
No abstract record available.
Inventors
- 👤 John W Wetzel
- 👤 Kenneth B Goldblum
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:33
CPC Classifications
B; B01; B01J; B01J13/00; B01J13/0091; C; C01; C01B; C01B33/00; C01B33/113; C01B33/12; C01B33/14; C01B33/157; C01B33/158; C01B33/1585
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
108 words
A PROCESS FOR PREPARING AN AEROGEL WHICH COMPRISES THE FOLLOWING SEQUENTIAL STEPS, (1) FORMING BY PRECIPITATION AN AQUEOUS SOL FROM AN ALKALI-METAL SILICATE, (2) REMOVING THE WATER FROM THE AQUEOUS SOL BY DISTILLING THE WATER THEREFROM WITH AN AZEOTROPE COMPRISING AN ALIPHATIC MONOHYDRIC-ALCOHOL HAVING A CRITICAL TEMPERATURE BELOW 300*C. WHILE MAINTAINING THE VOLUME OF SOLVENT CONSTANT BY THE ADDITION OF ONE OF SAID ALIPHATIC MONOHYDRIC ALCOHOLS, SAID AZEOTROPIC DISTILLATION BEING CARRIED OUT UNTIL SUBSTANTIALLY ALL THE WATER HAS BEEN REMOVED FROM THE AQUEOUS SOL, AND (3) REMOVING BY EVAPORATION THE REMAINING ALCOHOL AT A TEMPERATURE AND PRESSURE OF AT LEAST THE CRITICAL TEMPERATURE AND PRESSURE OF THE ALCOHOL.
Claim 2
Dependent Claim
108 words
A PROCESS FOR PREPARING AN AEROGEL WHICH COMPRISES THE FOLLOWING SEQUENTIAL STEPS, (1) FORMING BY PRECIPITATION AN AQUEOUS SOL FROM AN ALKALI-METAL SILICATE, (2) REMOVING THE WATER FROM THE AQUEOUS SOL BY DISTILLING THE WATER THEREFROM WITH AN AZEOTROPE COMPRISING AN ALIPHATIC MONOHYDRIC-ALCOHOL HAVING A CRITICAL TEMPERATURE BELOW 300*C. WHILE MAINTAINING THE VOLUME OF SOLVENT CONSTANT BY THE ADDITION OF ONE OF SAID ALIPHATIC MONOHYDRIC ALCOHOLS, SAID AZEOTROPIC DISTILLATION BEING CARRIED OUT UNTIL SUBSTANTIALLY ALL THE WATER HAS BEEN REMOVED FROM THE AQUEOUS SOL, AND (3) REMOVING BY EVAPORATION THE REMAINING ALCOHOL AT A TEMPERATURE AND PRESSURE OF AT LEAST THE CRITICAL TEMPERATURE AND PRESSURE OF THE ALCOHOL.
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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) | 1964-04-03 | 1964-10-03 | 1965-04-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-04-03 | 1968-10-03 | 1969-04-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-04-03 | 1972-10-03 | 1973-04-04 | $7700.00 | Window Closed / Lapsed |