Patent US3680727A successfully refreshed from Google Patents.
US3680727A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Underground storage tank for liquids
Assignee: Owens Corning
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Filing: 1969-10-15
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Granted: 1972-08-01
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Expires: 1989-10-15
Abstract
Abstract An underground storage tank for fluids is made by forming hollow wall sections of reinforced plastic on a mold having a surface of double curvature, abutting the wall sections at their congruent open ends, and providing an endless reinforced plastic joint on the line of abuttment. The combination of a double curvature surface and multidirectional strength provided by randomly dispersed chopped glass strands in the resin matrix, provides resistance to the crushing forces of the surrounding earth. A planar surface is either formed on or molded into the tank wall for attaching an assembly of fittings thereto.
Inventors
- 👤 Lee E Pearson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 06:26
CPC Classifications
B; B65; B65D; B65D90/00; B65D90/02; B65D90/029; B29; B29D; B29D22/00; B65D88/00; B65D88/02; B65D88/04; B29K; B29K2105/00; B29K2105/06; Y; Y10; Y10S; Y10S220/00; Y10S220/917
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
104 words
An underground storage tank for fluids, comprising: two wall sections of hardenable resin reinforced with randomly dispersed bundles of discontinuous glass filaments, each wall section having a concave inner surface and a hemispherical outer surface, and each wall section further having an open end, wherein the open end of one wall section is disposed in coterminous abutting relationship with the open end of the other wall section forming an endless line of abuttment on the surface of the tank; and means joining said wall sections comprising an endless band of reinforced resin overlaying said line of abuttment and integrally bonded to said wall sections.
Claim 2
Dependent Claim
104 words
An underground storage tank for fluids, comprising: two wall sections of hardenable resin reinforced with randomly dispersed bundles of discontinuous glass filaments, each wall section having a concave inner surface and a hemispherical outer surface, and each wall section further having an open end, wherein the open end of one wall section is disposed in coterminous abutting relationship with the open end of the other wall section forming an endless line of abuttment on the surface of the tank; and means joining said wall sections comprising an endless band of reinforced resin overlaying said line of abuttment and integrally bonded to said wall sections.
Claim 3
Dependent Claim
107 words
An underground storage tank for fluids, comprising: two wall sections of hardenable resin reinforced with randomly dispersed bundles of discontinuous glass filaments, each wall section having an concave inner surface and a hemispherical outer surface and further having an open end, wherein the open end of one wall section is disposed in coterminous abutting relationship with the open end of the other wall section forming an endless line of abuttment on the surface of the tank; and means for permanently joining said wall sections comprising an endless band of resin reinforced with glass filaments overlaying said endless line of abuttment and integrally bonded to said wall sections.
Claim 4
Dependent Claim
107 words
An underground storage tank for fluids, comprising: two wall sections of hardenable resin reinforced with randomly dispersed bundles of discontinuous glass filaments, each wall section having an concave inner surface and a hemispherical outer surface and further having an open end, wherein the open end of one wall section is disposed in coterminous abutting relationship with the open end of the other wall section forming an endless line of abuttment on the surface of the tank; and means for permanently joining said wall sections comprising an endless band of resin reinforced with glass filaments overlaying said endless line of abuttment and integrally bonded to said wall sections.
Claim 5
Dependent Claim
35 words
An underground storage tank for fluids, as recited in claim 2, wherein the portion of said wall sections immediately adjacent their inner surfaces is substantially all resin covering a thin underlayer of randomly distributed filaments.
Claim 6
Dependent Claim
30 words
An underground storage tank for fluids, as recited in claim 2, wherein said bundles of discontinuous glass filamentS are predominately oriented parallel to the outer surface of said wall section.
Claim 7
Dependent Claim
42 words
An underground storage tank for fluids, as recited in claim 3, wherein the portion of said wall sections immediately adjacent their inner surfaces comprises 85 to 95 percent by weight resin reinforced with a thin mat of randomly oriented individual glass filaments.
Claim 8
Dependent Claim
45 words
An underground storage tank for fluids, as recited in claim 5, wherein the remainder of said wall sections comprises between 25 and 45 percent by weight resin and between 55 and 75 percent by weight bundles discontinuous of glass filaments randomly dispersed throughout said resin.
Claim 9
Dependent Claim
33 words
An underground storage tank for fluids recited in claim 2 wherein said endless band of reinforced resin comprises a layer of chopped strand mat saturated with resin and disposed adjacent said wall sections.
Claim 10
Dependent Claim
37 words
An underground storage tank for fluids, as recited in claim 7, wherein said endless band of reinforced resin further includes a layer of woven roving saturated with resin and disposed upon said layer of chopped strand mat.
Claim 11
Dependent Claim
75 words
An underground storage tank for fluids, as recited in claim 2, wherein one of said wall sections has a partial planar surface for receiving attachments thereon, the area of said partial planar surface being small in proportion to the overall surface area of said wall section; and further, wherein said wall section has at least one opening extending from the exterior of said planar surface to the interior of the tank for receiving a conduit.
Claim 12
Dependent Claim
54 words
An underground storage tank for fluids, as recited in claim 9, including: a fitting assembly comprising a base disposed on said partial planar surface, and at least one fluid conduit depending from said base and extending into said opening in said wall section; and means for securing said fitting assembly to said wall section.
Claim 13
Dependent Claim
58 words
The underground storage tank for fluids recited in claim 10, wherein, said means for attaching said fitting assembly comprises a layer of hardened resin reinforced with discrete bundles of glass filaments, disposed over and extending beyond the boundaries of said fitting base, wherein said extended portion of said reinforced resin layer is integrally bonded to said wall section.
Claim 14
Dependent Claim
37 words
An underground storage tank for fluids, as recited in claim 9, wherein said planar surface is provided by a built-up pad of resin reinforced with chopped glass strands disposed on and integrally bonded to said wall section.
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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) | 1975-08-01 | 1976-01-31 | 1976-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-01 | 1980-01-31 | 1980-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-01 | 1984-01-31 | 1984-08-01 | $7700.00 | Window Closed / Lapsed |