US4120418A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing a barrier in a thermally insulated container
Assignee: Shell Internationale Research Maatschappij BV
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Filing: 1976-06-04
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Granted: 1978-10-17
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Expires: 1996-06-04
Abstract
Abstract A method for producing a barrier in a thermally insulated container lined with polyurethane foam for storage or transport of liquefied gases, wherein a plurality of layers of an epoxy resin formulation and a glass-fiber material are applied in a particular sequence resulting in a barrier of superior quality essentially free of pinhole flaws.
Inventors
- 👤 Michael H. Collins
- 👤 Jeremy D. Le Hardy Guiton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 14:30
CPC Classifications
F; F17; F17C; F17C3/00; F17C3/02; F17C3/04; F17C3/06; B; B32; B32B; B32B1/00; B32B27/00; B32B27/06; B32B27/065; B32B27/08; B32B27/12; B32B27/18; B32B27/20; B32B27/26; B32B27/40; F17C13/00; F17C13/001; B32B2260/00; B32B2260/02; B32B2260/021; B32B2260/04; B32B2260/046; B32B2262/00; B32B2262/10; B32B2262/101; B32B2266/00; B32B2266/02; B32B2266/0214; B32B2266/0278; B32B2307/00; B32B2307/30; B32B2307/304; B32B2439/00; F17C2203/00; F17C2203/03; F17C2203/0304; F17C2203/0329; F17C2203/06; F17C2203/0634; F17C2203/0658; F17C2203/0663; F17C2223/00; F17C2223/01; F17C2223/0146; F17C2223/0153; F17C2223/0161; Y; Y10; Y10S; Y10S220/00; Y10S220/901; Y10T; Y10T428/00; Y10T428/13; Y10T428/131; Y10T428/1314; Y10T428/249921; Y10T428/249953; Y10T428/249987; Y10T428/249991
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
180 words
A method of producing a barrier in a thermally insulated container lined with polyurethane foam for storage or transport of liquefied gases, comprising the steps of: cutting or grinding an inner surface of polyurethane foam previously applied onto an inner surface of a container rigid outer shell to obtain a substantially flat cut or ground surface of polyurethane foam; applying a first layer of an epoxy resin formulation, comprising an epoxy resin and a curing agent, onto the polyurethane foam cut or ground surface; allowing the epoxy resin formulation first layer to gel; applying a second layer of an epoxy resin formulation, comprising an epoxy resin and a curing agent, onto the gelled first layer; applying a layer of glass-fiber material onto the second layer when the epoxy resin formulation of the second layer is still wet; compacting the glass-fiber material into the second layer; applying a third layer of an epoxy resin formulation, comprising an epoxy resin and a curing agent, onto the second layer; and allowing the epoxy resin formulations of the second and third layers to gel.
Claim 2
Independent Claim
180 words
A method of producing a barrier in a thermally insulated container lined with polyurethane foam for storage or transport of liquefied gases, comprising the steps of: cutting or grinding an inner surface of polyurethane foam previously applied onto an inner surface of a container rigid outer shell to obtain a substantially flat cut or ground surface of polyurethane foam; applying a first layer of an epoxy resin formulation, comprising an epoxy resin and a curing agent, onto the polyurethane foam cut or ground surface; allowing the epoxy resin formulation first layer to gel; applying a second layer of an epoxy resin formulation, comprising an epoxy resin and a curing agent, onto the gelled first layer; applying a layer of glass-fiber material onto the second layer when the epoxy resin formulation of the second layer is still wet; compacting the glass-fiber material into the second layer; applying a third layer of an epoxy resin formulation, comprising an epoxy resin and a curing agent, onto the second layer; and allowing the epoxy resin formulations of the second and third layers to gel.
Claim 3
Dependent Claim
96 words
The method of claim 1, including the steps of: applying a fourth layer of an epoxy resin formulation, comprising an epoxy resin and a curing agent, onto the gelled third layer; applying a layer of glass-fiber material onto the fourth layer when the epoxy resin formulation of the fourth layer is still wet; compacting the glass-fiber material into the fourth layer; applying a fifth layer of an epoxy resin formulation, comprising an epoxy resin and a curing agent, onto the fourth layer; and allowing the epoxy resin formulations of the fourth and fifth layers to gel.
Claim 4
Dependent Claim
215 words
A thermally insulated container for storage or transport of liquefied gases, comprising a lining of polyurethane foam arranged on an inner surface of a rigid outer shell, wherein the lining of polyurethane foam is provided with a barrier consisting of glass-fiber material and an epoxy resin system, and wherein the barrier is produced according to a method comprising the steps of: cutting or grinding an inner surface of polyurethane foam previously applied onto an inner surface of a container rigid outer shell to obtain a substantially flat cut or ground surface of polyurethane foam; applying a first layer of an epoxy resin formulation, comprising an epoxy resin and a curing agent, onto the polyurethane foam cut or ground surface; allowing the epoxy resin formulation first layer to gel; applying a second layer of an epoxy resin formulation, comprising an epoxy resin and a curing agent, onto the gelled first layer; applying a layer of glass-fiber material onto the second layer when the epoxy resin formulation of the second layer is still wet; compacting the glass-fiber material into the second layer; applying a third layer of an epoxy resin formulation, comprising an epoxy resin and a curing agent, onto the second layer; and allowing the epoxy resin formulations of the second and third layers to gel.
Claim 5
Dependent Claim
215 words
A thermally insulated container for storage or transport of liquefied gases, comprising a lining of polyurethane foam arranged on an inner surface of a rigid outer shell, wherein the lining of polyurethane foam is provided with a barrier consisting of glass-fiber material and an epoxy resin system, and wherein the barrier is produced according to a method comprising the steps of: cutting or grinding an inner surface of polyurethane foam previously applied onto an inner surface of a container rigid outer shell to obtain a substantially flat cut or ground surface of polyurethane foam; applying a first layer of an epoxy resin formulation, comprising an epoxy resin and a curing agent, onto the polyurethane foam cut or ground surface; allowing the epoxy resin formulation first layer to gel; applying a second layer of an epoxy resin formulation, comprising an epoxy resin and a curing agent, onto the gelled first layer; applying a layer of glass-fiber material onto the second layer when the epoxy resin formulation of the second layer is still wet; compacting the glass-fiber material into the second layer; applying a third layer of an epoxy resin formulation, comprising an epoxy resin and a curing agent, onto the second layer; and allowing the epoxy resin formulations of the second and third layers to gel.
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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) | 1981-10-16 | 1982-04-17 | 1982-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-10-16 | 1986-04-17 | 1986-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-10-16 | 1990-04-17 | 1990-10-17 | $7700.00 | Window Closed / Lapsed |