US3734802A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for leaching glass films
Assignee: Owens Corning
•
Filing: 1971-03-19
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Granted: 1973-05-22
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Expires: 1991-03-19
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
- 👤 C Cohen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:38
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: 5
Claim 1
Independent Claim
116 words
Apparatus for leaching film comprising: a container; means within the container for support of film to be leached including a porous member having an upper surface on which the film is rested during leaching and a lower surface at the opposite side of the member and support means holding the porous member in an inclined position to the horizontal effective to permit liquid supplied to the container to directly contact the lower surface; and means for controllably supplying leaching liquid to the container to a level at the upper surface of the member in the container, liquid being supplied to the upper surface from liquid that has moved through the porous member from the lower surface.
Claim 2
Dependent Claim
60 words
Apparatus recited in claim 2 in which the support means holding the porous member is a hollow body on the bottom of the container, the body having an upper opening communicating with its interior and at least one lower opening to permit liquid supplied to the container to enter interiorly of the body, the porous member closing the upper opening.
Claim 3
Dependent Claim
14 words
Apparatus recited in claim 3 in which the hollow body is a tubular member.
Claim 4
Dependent Claim
18 words
Apparatus recited in claim 2 wherein the porous member is inclined not greater than 5* from the horizontal.
Claim 5
Dependent Claim
19 words
Apparatus recited in claim 4 further comprising means within the tubular member for stirring liquid supplied to the container.
References Cited (Backward Citations)
US206392A
Cited
US3095463A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-05-21 | 1976-11-20 | 1977-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-21 | 1980-11-20 | 1981-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-21 | 1984-11-20 | 1985-05-22 | $7700.00 | Window Closed / Lapsed |