Patent US3758284A successfully refreshed from Google Patents.
US3758284A
Expired / Lapsed
US
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Porous material and method of making the same
Assignee: Individual
•
Filing: 1970-12-17
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Granted: 1973-09-11
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Expires: 1990-12-17
Abstract
Abstract A POROUS GLASS HAVING A MORE UNIFORM PORE SIZE DISTRIBUTION USEFUL, E.G., AS A SEPARATION MEDIUM, IS PRODUCED FROM A MELT OF A TERNARY SYSTEM WHICH CAN BE SEPARATED BY HEAT TREATMENT INTO TWO IMMISCIBLE PHASES. AFTER COOLING ONE PHASE IS LEACHED OUT. THE HEAT TREATMENT IS IN ACCORDANCE WITH THE FORMULA RN=KTE-M/T WHERE R IS DESIRED PORE RADIUS (A.), T IS TIME IN HOURS, T IS TEMPERATURE (*K.), AND M, N AND K ARE EXPERIMENTALLY DETERMINED CONSTANTS.
Inventors
- 👤 W Haller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:59
CPC Classifications
C; C03; C03C; C03C11/00; C03C11/005; B; B01; B01J; B01J20/00; B01J20/02; B01J20/10; B01J20/103; B01J20/28; B01J20/28002; B01J20/28004; B01J20/281; B01J20/282; B01J20/283; B01J20/286; B01J20/30; B01J20/3071; B01J20/3078; B01J20/32; B01J20/3202; B01J20/3204; B01J20/3231; B01J20/3242; B01J20/3244; B01J20/3246; B01J20/3257; 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) | 1976-09-10 | 1977-03-12 | 1977-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-10 | 1981-03-12 | 1981-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-10 | 1985-03-12 | 1985-09-11 | $7700.00 | Window Closed / Lapsed |