Patent US3782915A successfully refreshed from Google Patents.
US3782915A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Surface-deactivated porous glass
Assignee: Corning Glass Works
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Filing: 1971-12-27
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Granted: 1974-01-01
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Expires: 1991-12-27
Abstract
Abstract POROUS GLASS BODIES ESSENTIALLY FREE OF SURFACE LEWIS ACID SITES ARE PREPARED BY EXPOSING THE BODIES TO NH3 OR STEAM AT GLASS BODY TEMPERATURES OF 800*-1000*C. THE TREATED GLASS BODIES ARE ESPECIALLY USEFUL FOR APPLICATIONS IN WHICH THE SURFACE ACTIVITY ATTRIBUTABLE TO LEWIS ACID SITES IS DESIRABLY AVOIDED (E.G., AS CHROMATOGRAPHIC SUPPORT OR SEPARATION MEDIA).
Inventors
- 👤 A Filbert
- 👤 M Hair
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 15:48
CPC Classifications
C; C03; C03C; C03C11/00; B; B01; B01J; B01J20/00; B01J20/281; B01J20/282; B01J20/283; C03C15/00; C03C23/00; C03C23/008; B01J2220/00; B01J2220/50; B01J2220/54
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-12-31 | 1977-07-02 | 1978-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-31 | 1981-07-02 | 1982-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-31 | 1985-07-02 | 1986-01-01 | $7700.00 | Window Closed / Lapsed |