US3575581A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat-generating pipe utilizing skin effect current controlled locally in heat generation by short-circuiting bridges
Assignee: JNC Corp
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Filing: 1969-05-15
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Granted: 1971-04-20
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Expires: 1989-05-15
Abstract
Abstract In a heat-generating pipe comprising a highly ferromagnetic pipe and an insulated conductor line inserted therein and having such a connection that AC flowing through the insulated conductor line is equal in intensity and opposite in direction to the AC flowing concentratedly through the inner wall portion of the pipe due to the skin effect of AC, the heat-generating pipe is characterized in that a certain section of the inner surface of the pipe is brought to short circuit state by a conductor line optionally including a thermostatic or other switch and having an impedance which is selected according to the requirement for decreasing or elimination of heat generation in said section, to control the heat generated in said section.
Inventors
- 👤 Masao Ando
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 07:30
CPC Classifications
F; F24; F24H; F24H1/00; F24H1/10; F24H1/101; F24H1/102; F24H1/105
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
199 words
In the known type of heat generating apparatus comprising a length of ferromagnetic pipe, a first length of an electrical conductor line disposed within said ferromagnetic pipe but insulated therefrom, and electrical and power connections so that upon the passage of alternating voltage through said first length of electrical conductor line there is a concentrated flow of current along the inner skin of the ferromagnetic pipe to thereby generate heat in said ferromagnetic pipe, the improvement which comprises: a. at least one additional length of electrical conductor line disposed within said length of ferromagnetic pipe, B. said additional length of electrical conductor line being shorter than said first length of electrical conductor line and arranged generally parallel to at least a portion of said first length of electrical conductor line, c. said additional length of conductor line being connected to said ferromagnetic pipe at two spaced apart points whereby the concentrated flow of current along the inner skin of the ferromagnetic pipe is at least partially short circuited along the inner surface thereof between said two spaced apart points to an extent dependent upon the impedance of said additional length of conductor line between said two spaced apart points.
Claim 2
Dependent Claim
199 words
In the known type of heat generating apparatus comprising a length of ferromagnetic pipe, a first length of an electrical conductor line disposed within said ferromagnetic pipe but insulated therefrom, and electrical and power connections so that upon the passage of alternating voltage through said first length of electrical conductor line there is a concentrated flow of current along the inner skin of the ferromagnetic pipe to thereby generate heat in said ferromagnetic pipe, the improvement which comprises: a. at least one additional length of electrical conductor line disposed within said length of ferromagnetic pipe, B. said additional length of electrical conductor line being shorter than said first length of electrical conductor line and arranged generally parallel to at least a portion of said first length of electrical conductor line, c. said additional length of conductor line being connected to said ferromagnetic pipe at two spaced apart points whereby the concentrated flow of current along the inner skin of the ferromagnetic pipe is at least partially short circuited along the inner surface thereof between said two spaced apart points to an extent dependent upon the impedance of said additional length of conductor line between said two spaced apart points.
Claim 3
Dependent Claim
44 words
A heat-generating pipe according to claim 1 wherein at least one switchgear is interposed at a position within the short circuit shunting said inner surface so as to control the heat generation within said section of said heat generating pipe on an on-off basis.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-04-19 | 1974-10-19 | 1975-04-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-19 | 1978-10-19 | 1979-04-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-19 | 1982-10-19 | 1983-04-20 | $7700.00 | Window Closed / Lapsed |