Patent US3615958A successfully refreshed from Google Patents.
US3615958A
Expired / Lapsed
US
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Leaching glass films for filter making
Assignee: Owens Corning
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Filing: 1968-05-03
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Granted: 1971-10-26
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Expires: 1988-05-03
Abstract
Abstract Apparatus and method for leaching films including a container having within it means for supporting the film in inclined disposition during introduction and removal of heated fluids.
Inventors
- 👤 Charles I Cohen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:44
CPC Classifications
C; C03; C03C; C03C15/00; B; B01; B01D; B01D61/00; B01D61/14; B01D61/145; B01D63/00; B01D63/06; B01D71/00; B01D71/02; B01D71/024; B01D71/027
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
30 words
The method of acid leaching recited in claim 1 where raising the temperature of the film is accomplished by immersing the film in distilled water heated to the predetermined temperature.
Claim 2
Dependent Claim
33 words
The method of acid leaching recited in claim 1 where raising the temperature of the film to the predetermined valve is accomplished by exposing the glass film to steam introduced into the container.
Claim 3
Dependent Claim
14 words
The method of acid leaching recited in claim 3 where the acid is hydrochloric.
Claim 4
Dependent Claim
43 words
The method of acid leaching recited in claim 1 where the temperature of the film is initially raised to from 140* F. to 180* and subsequently the temperature of the acid is reduced from 30* to 40* F. below the initial film temperature.
Claim 5
Independent Claim
80 words
The method of acid leaching inorganic glass film having an alkaline-earth component usable for making a filter comprising: supporting an inorganic glass film on a porous substrate; raising the temperature of the film by contacting the film with water; and moving an acid having a temperature substantially the same as the heated film through the porous substrate to contact just the surface of the film against the substrate to remove the alkaline-earth component without separating the film from the substrate.
Claim 6
Independent Claim
93 words
The method of acid leaching an inorganic glass film usable for making a filter comprising: supporting on a porous substrate an inorganic glass film having an acid soluble alkaline-earth-rich component and having a thickness of between 10-40 one hundred-thousandths of an inch; contacting the film with water to raise its temperature; and moving acid having substantially the same temperature as the temperature of the heated film through the porous substrate and contacting only the surface of the film facing the substrate to remove the alkaline-earth-rich component without separating the film from the substrate.
Claim 7
Dependent Claim
24 words
The method of acid leaching recited in claim 7 in which the inorganic glass film is supported in a position inclined from the horizontal.
Claim 8
Dependent Claim
25 words
The method of acid leaching recited in claim 8 in which the glass film is inclined from the horizontal from less than 1* to 5*.
Claim 9
Dependent Claim
43 words
The method of acid leaching recited in claim 7 where the inorganic glass film has the following composition: Ca, 16 to 19 percent; MgO, 3 to 6 percent; Al2O3, 12 to 16 percent; SiO2, 52 to 56 percent; and B2O3,9 to 11 percent.
Claim 10
Independent Claim
107 words
The method of acid leaching an inorganic glass film usable for making a filter comprising: supporting on a porous substrate an inorganic glass film having an acid soluble alkaline-earth-rich component and having a thickness of between 10-40 one hundred-thousandths of an inch; raising the temperature of thE film to a temperature in the range of from 140* to 180* F. by contacting the film with hot water; and moving acid having substantially the same temperature as the heated film through the porous substrate into contact with only the surface of the film facing the substrate to remove the alkaline-earth-rich component without separating the film from the substrate.
Claim 11
Dependent Claim
14 words
The method of claim 6 in which the water is in the vapor phase.
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) | 1974-10-25 | 1975-04-26 | 1975-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-25 | 1979-04-26 | 1979-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-25 | 1983-04-26 | 1983-10-26 | $7700.00 | Window Closed / Lapsed |