US3970863A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Element and method for detecting leakage of petroleum products
Assignee: Japan National Railways
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Filing: 1974-12-13
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Granted: 1976-07-20
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Expires: 1994-12-13
Abstract
Abstract A styrene-butadiene-styrene block copolymer containing 50 to 70% by weight of butadiene can be used as a base material of an element capable of detecting leakage of petroleum products by detecting to the change in an electrical signal. By use of this detecting element any leakage of petroleum products from a transportation pipe line may be detected and located quickly and precisely.
Inventors
- 👤 Hiroshi Kishikawa
- 👤 Takayoshi Adachi
- 👤 Tamio Usami
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:58
CPC Classifications
G; G01; G01M; G01M3/00; G01M3/02; G01M3/04; G01M3/042; G01M3/045; G01M3/16; G01M3/18
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
39 words
An element for detecting and locating leakage of petroleum product by detecting the change in an electric signal, which element comprises a styrene-butadiene-styrene block copolymer of a butadiene content of 50 to 70% by weight and an electroconductive metal.
Claim 2
Dependent Claim
39 words
An element for detecting and locating leakage of petroleum product by detecting the change in an electric signal, which element comprises a styrene-butadiene-styrene block copolymer of a butadiene content of 50 to 70% by weight and an electroconductive metal.
Claim 3
Dependent Claim
16 words
An element according to claim 1, wherein the electroconductive metal is gold, silver, copper, or aluminum.
Claim 4
Dependent Claim
18 words
An element according to claim 1, which is in the form of wire, ribbon, rod, sheet, or block.
Claim 5
Dependent Claim
16 words
An element according to claim 1, wherein the petroleum product is gasoline, kerosene, or light oil.
Claim 6
Dependent Claim
54 words
An element for detecting and locating leakage of petroleum product by detecting the change in an electric signal, which element is composed of a shaped article comprising a styrene-butadiene-styrene block copolymer of a butadiene content of 50 to 70% by weight and an electroconductive metallic layer vacuum-deposited on the surface of the shaped article.
Claim 7
Dependent Claim
54 words
An element for detecting and locating leakage of petroleum product by detecting the change in an electric signal, which element is composed of a shaped article comprising a styrene-butadiene-styrene block copolymer of a butadiene content of 50 to 70% by weight and an electroconductive metallic layer vacuum-deposited on the surface of the shaped article.
Claim 8
Dependent Claim
54 words
An element for detecting and locating leakage of petroleum product by detecting the change in an electric signal, which element is composed of a shaped article comprising a styrene-butadiene-styrene block copolymer of a butadiene content of 50 to 70% by weight and an electroconductive metal foil adhered to the surface of the shaped article.
Claim 9
Dependent Claim
54 words
An element for detecting and locating leakage of petroleum product by detecting the change in an electric signal, which element is composed of a shaped article comprising a styrene-butadiene-styrene block copolymer of a butadiene content of 50 to 70% by weight and an electroconductive metal foil adhered to the surface of the shaped article.
Claim 10
Dependent Claim
49 words
An element for detecting and locating leakage of petroleum product by detecting the change in an electric signal, which element is composed of a shaped article comprising a mixture of the styrene-butadiene-styrene block copolymer of a butadiene content of 50 to 70% by weight and an electroconductive powdered metal.
Claim 11
Dependent Claim
49 words
An element for detecting and locating leakage of petroleum product by detecting the change in an electric signal, which element is composed of a shaped article comprising a mixture of the styrene-butadiene-styrene block copolymer of a butadiene content of 50 to 70% by weight and an electroconductive powdered metal.
Claim 12
Dependent Claim
65 words
An element for detecting and locating leakage of petroleum product by detecting the change in an electric signal, which element is composed of a base material comprising the styrene-butadiene-styrene block copolymer of a butadiene content of 50 to 70% by weight and an electroconductive layer comprising the styrene-butadiene-styrene block copolymer of a butadiene content of 50 to 70% by weight and an electroconductive powdered metal.
Claim 13
Dependent Claim
65 words
An element for detecting and locating leakage of petroleum product by detecting the change in an electric signal, which element is composed of a base material comprising the styrene-butadiene-styrene block copolymer of a butadiene content of 50 to 70% by weight and an electroconductive layer comprising the styrene-butadiene-styrene block copolymer of a butadiene content of 50 to 70% by weight and an electroconductive powdered metal.
Claim 14
Dependent Claim
51 words
An element for detecting and locating leakage of petroleum product by detecting the change in an electric signal, which element is composed of a nonelectroconductive base material and an electroconductive layer comprising the styrene-butadiene-styrene block copolymer of a butadiene content of 50 to 70% by weight and an electroconductive powdered metal.
Claim 15
Dependent Claim
51 words
An element for detecting and locating leakage of petroleum product by detecting the change in an electric signal, which element is composed of a nonelectroconductive base material and an electroconductive layer comprising the styrene-butadiene-styrene block copolymer of a butadiene content of 50 to 70% by weight and an electroconductive powdered metal.
Claim 16
Independent Claim
71 words
A method for detecting and locating leakage of petroleum products from a carrier, comprising: sending an electric signal through a detecting means comprised of a styrene-butadiene-styrene block copolymer of a butadiene content of 50 to 70% by weight and an electroconductive metal which is adjacent to said carrier, and sensing change in said electric signal caused by a change of volume of said detecting means when contacted with said petroleum products.
Claim 17
Independent Claim
71 words
A method for detecting and locating leakage of petroleum products from a carrier, comprising: sending an electric signal through a detecting means comprised of a styrene-butadiene-styrene block copolymer of a butadiene content of 50 to 70% by weight and an electroconductive metal which is adjacent to said carrier, and sensing change in said electric signal caused by a change of volume of said detecting means when contacted with said petroleum products.
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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) | 1979-07-20 | 1980-01-19 | 1980-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-07-20 | 1984-01-19 | 1984-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-07-20 | 1988-01-19 | 1988-07-20 | $7700.00 | Window Closed / Lapsed |