US3665154A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for constructing transportation pipes and heat generating pipes utilizing skin-effect current
Assignee: JNC Corp
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Filing: 1970-03-05
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Granted: 1972-05-23
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Expires: 1990-03-05
Abstract
Abstract Units of transportation pipes heated by the skin-effect current flowing concentratedly only through the inner wall skin portion of a ferromagnetic pipe in which an insulated conductor line forming a primary circuit is placed to pass AC therethrough are constructed by electrically connecting the skin-effect current heat-generating pipes at all connecting parts of the transportation pipe so as to form a secondary circuit in all units of the transportation pipe by an electric connection between the said unit of the transportation pipe and the corresponding part of the skin-effect current heat-generating pipe.
Inventors
- 👤 Masao Ando
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:02
CPC Classifications
H; H05; H05B; H05B6/00; H05B6/02; H05B6/10; H05B6/105; H05B6/108; F; F16; F16L; F16L53/00; F16L53/30; F16L53/34
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
60 words
Apparatus for heating a transportation pipe including a plurality of discontinuous heat-generating pipe sections, a source of electrical energy, an insulated conductor connected to said source forming a primary current path, said discontinuous heat-generating pipe sections forming series-connected portions of a secondary current path, other series-connected portions of said secondary current path being formed of portions of said transportation pipe.
Claim 2
Dependent Claim
60 words
Apparatus for heating a transportation pipe including a plurality of discontinuous heat-generating pipe sections, a source of electrical energy, an insulated conductor connected to said source forming a primary current path, said discontinuous heat-generating pipe sections forming series-connected portions of a secondary current path, other series-connected portions of said secondary current path being formed of portions of said transportation pipe.
Claim 3
Dependent Claim
15 words
The apparatus of claim 1 wherein said transportation pipe is made of a metallic material.
Claim 4
Dependent Claim
17 words
The apparatus of claim 2 wherein said discontinuous heat-generating pipe sections are welded to said transportation pipe.
Claim 5
Dependent Claim
37 words
The apparatus of claim 1 wherein said transportation pipe is made of non-metallic material, said plurality of discontinuous heat-generating pipe sections are attached to said transportation pipe and said discontinuous heat-generating pipe sections are mutually connected electrically.
Claim 6
Independent Claim
116 words
A method for constructing units of transportation pipe heated by skin-effect current flowing through the inner wall skin portion of a ferromagnetic pipe including the steps of, providing said ferromagnetic pipe of a length shorter than said units of transportation pipe, providing a source of electrical current, providing a primary circuit path for said current comprising an insulated conductor passing through said ferromagnetic pipe and connected to said source, providing a portion of a secondary path for said current through a wall of said ferromagnetic pipe, and providing a further secondary path for said current comprising a portion of said units of transportation pipe to form the respective secondary circuits in said units of transportation pipe.
Claim 7
Independent Claim
116 words
A method for constructing units of transportation pipe heated by skin-effect current flowing through the inner wall skin portion of a ferromagnetic pipe including the steps of, providing said ferromagnetic pipe of a length shorter than said units of transportation pipe, providing a source of electrical current, providing a primary circuit path for said current comprising an insulated conductor passing through said ferromagnetic pipe and connected to said source, providing a portion of a secondary path for said current through a wall of said ferromagnetic pipe, and providing a further secondary path for said current comprising a portion of said units of transportation pipe to form the respective secondary circuits in said units of transportation pipe.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-23 | 1975-11-22 | 1976-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-23 | 1979-11-22 | 1980-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-23 | 1983-11-22 | 1984-05-23 | $7700.00 | Window Closed / Lapsed |