Patent US3848765A successfully refreshed from Google Patents.
US3848765A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tank for fuel oil or other liquids
Assignee: FORVAL VERKAUFSGES DUERKOP H AND
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Filing: 1971-06-17
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Granted: 1974-11-19
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Expires: 1991-06-17
Abstract
Abstract A double-walled tank is provided for the storage of fuel oil and other liquids and comprises a spaced inner and outer tank in accordance with known concepts. In the present disclosure the outer tank is made of asbestos-cement, preferably with continuously wound asbestos fibers.
Inventors
- 👤 H Duerkop
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:15
CPC Classifications
B; B65; B65D; B65D90/00; B65D90/02; B65D90/06
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
104 words
A container assembly comprising an inner and an outer tank adapted for under ground large capacity storage of fuel oil and other liquids, said outer tank being formed as a cylindrical tube made substantially entirely of asbestos-cement of a thickness to be self supporting of its own weight and the weight of the inner tank, said tube including ends, at least one end being closed and sealed by a lid, said lid including two plates of asbestos-cement secured together in face to face relation and having asbestos fibers in each plate oriented at substantially ninety degrees relative to the fibers of the other plate.
Claim 2
Dependent Claim
104 words
A container assembly comprising an inner and an outer tank adapted for under ground large capacity storage of fuel oil and other liquids, said outer tank being formed as a cylindrical tube made substantially entirely of asbestos-cement of a thickness to be self supporting of its own weight and the weight of the inner tank, said tube including ends, at least one end being closed and sealed by a lid, said lid including two plates of asbestos-cement secured together in face to face relation and having asbestos fibers in each plate oriented at substantially ninety degrees relative to the fibers of the other plate.
Claim 3
Dependent Claim
19 words
A container as set forth in claim 1 wherein the asbestos-cement of said tube comprises continuously wound asbestos fibers.
Claim 4
Dependent Claim
18 words
A container as set forth in claim 1 wherein one of the lids is integral with said tube.
Claim 5
Dependent Claim
22 words
A container as set forth in claim 1 wherein at least one of the lids is adhesively secured to the cylindrical tube.
Claim 6
Dependent Claim
31 words
A container as set forth in claim 1 wherein said lids form vertical end walls for said outer tank and at least one of said vertical end walls is substantially flat.
Claim 7
Dependent Claim
31 words
A container as set forth in claim 1 wherein said lids form vertical end walls for said outer tank and at least one of said vertical end walls is concave-convex configuration.
Claim 8
Dependent Claim
16 words
A container as set forth in claim 1 wherein the inner tank comprises a plastic film.
Claim 9
Dependent Claim
30 words
A container as set forth in claim 1 and further including sensing means disposed between said tanks to sense the entry of liquid into the space between said two tanks.
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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) | 1977-11-18 | 1978-05-20 | 1978-11-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-18 | 1982-05-20 | 1982-11-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-18 | 1986-05-20 | 1986-11-19 | $7700.00 | Window Closed / Lapsed |