US3718804A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fixing heat-generating pipe utilizing skin effect current
Assignee: JNC Corp
•
Filing: 1971-07-02
•
Granted: 1973-02-27
•
Expires: 1991-07-02
Abstract
Abstract A heat-generating pipe arrangement utilizing skin effect current includes a ferromagnetic pipe and an insulated conductor line passing through the interior of the pipe and having such a circuit therewith that current is concentrated and passed only through the inner surface of the pipe when an alternating current is passed through the circuit. The heat-generating pipe is spaced apart from the outside wall of a pipeline to be heated by interposed spacing means whereby a small clearance of about a millimeter is created and maintained over the entire length of the ferromagnetic pipe to protect the pipeline from being damaged by a possible arc in the event of a failure of the insulation on the conductor inside the ferromagnetic pipe.
Inventors
- 👤 M Ando
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:06
CPC Classifications
H; H05; H05B; H05B6/00; H05B6/02; H05B6/10; H05B6/105; H05B6/108; F; F16; F16L; F16L53/00; F16L53/30; F16L53/34; Y; Y10; Y10T; Y10T137/00; Y10T137/6416; Y10T137/6606
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
160 words
A heating structure which comprises a. a heat-generating pipe utilizing skin effect current and consisting of a ferromagnetic pipe and an insulated conductor line, 1. said insulated conductor line A. passing through the interior of the ferromagnetic pipe, and B. having such a circuit that a current is concentrated to and passed only through the inner portion of the ferromagnetic pipe when an alternating current is passed through the conductor line, b. a pipeline to be heated by said heat-generating line, c. said heat-generating pipe and said pipeline being longitudinally aligned with respect to each other, with the heat-generating pipe located adjacent the outside wall of said pipeline, d. spacing means being welded between said heat generating pipe and said pipeline, e. the size and placement of said spacing means being such that a small clearance in the order of about a millimeter is maintained between said heat-generating pipe and said pipeline over the entire length of the heat-generating pipe.
Claim 2
Dependent Claim
160 words
A heating structure which comprises a. a heat-generating pipe utilizing skin effect current and consisting of a ferromagnetic pipe and an insulated conductor line, 1. said insulated conductor line A. passing through the interior of the ferromagnetic pipe, and B. having such a circuit that a current is concentrated to and passed only through the inner portion of the ferromagnetic pipe when an alternating current is passed through the conductor line, b. a pipeline to be heated by said heat-generating line, c. said heat-generating pipe and said pipeline being longitudinally aligned with respect to each other, with the heat-generating pipe located adjacent the outside wall of said pipeline, d. spacing means being welded between said heat generating pipe and said pipeline, e. the size and placement of said spacing means being such that a small clearance in the order of about a millimeter is maintained between said heat-generating pipe and said pipeline over the entire length of the heat-generating pipe.
Claim 3
Dependent Claim
33 words
A heating structure according to claim 1 wherein the spacing means is fully covered with a heat-transfer cement so as to thereby improve the heat transfer between the heat-generating pipe and the pipeline.
Claim 4
Dependent Claim
24 words
A heating structure according to claim 1 wherein heat-transfer carbonaceous cement fully occupies the entire clearance space between the heat-generating pipe and the pipeline.
Claim 5
Dependent Claim
24 words
A heating structure which comprises a. a heat-generating pipe utilizing skin effect current and consisting of a ferromagnetic pipe and an insulated conductor line,
Claim 6
Dependent Claim
24 words
A heating structure which comprises a. a heat-generating pipe utilizing skin effect current and consisting of a ferromagnetic pipe and an insulated conductor line,
Claim 7
Dependent Claim
33 words
A heating structure according to claim 4 wherein heat-transfer cement comprising a carbonaceous material fully covers the spacing means so as to thereby improve heat transfer between the heat-generating pipe and the pipeline.
Claim 8
Dependent Claim
27 words
A heating structure according to claim 4 wherein heat-transfer cement comprising a carbonaceous material fully occupies the entire clearance Space between the heat-generating pipe and the pipeline.
References Cited (Backward Citations)
US1946547A
Cited
US3293407A
Cited
US3214571A
Cited
US3293409A
Cited
US3423570A
Cited
US3524966A
Cited
US3598959A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-02-27 | 1976-08-28 | 1977-02-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-27 | 1980-08-28 | 1981-02-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-27 | 1984-08-28 | 1985-02-27 | $7700.00 | Window Closed / Lapsed |