US3755650A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Elongated heat-generating apparatus providing for a reduction in the highest voltage to be applied
Assignee: JNC Corp
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Filing: 1971-11-16
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Granted: 1973-08-28
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Expires: 1991-11-16
Abstract
Abstract An elongated heat-generating apparatus is divided into at least two sections and a transformer is provided at each division between adjacent sections of said at least two sections and linked with the electrical circuits of the adjacent sections. The output voltage of the transformer is as near as possible to the highest voltage allowed for the section, the resistance of which is adjusted in relation to the definite voltage to meet the required quantity of heat in that section.
Inventors
- 👤 M Ando
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:26
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: 6
Claim 1
Independent Claim
176 words
Elongate electrical heat generating apparatus comprising: an elongate electrically conductive heat generating body which is divided into at least two sections, a transformer for each of said sections, a source of alternating electric power, circuit means including the secondary of each said transformer and also the associated section of said conductive body for passing an electric current along the length of said section, said circuit means further including the primary of the transformer for the next said section more remote from said source for energizing said primary with the current passing through the associated section, each said transformer providing across its secondary winding substantially the same predetermined voltage, said transformer secondaries further providing different respective current amplitudes with each such secondary for a section of said conductive body nearer said source providing a current amplitude greater than that provided for the next more remote section, and means for providing different electrical resistances for the respective said circuit means associated with said transformer secondaries to provide a predetermined heat output per unit length for each said section.
Claim 2
Dependent Claim
176 words
Elongate electrical heat generating apparatus comprising: an elongate electrically conductive heat generating body which is divided into at least two sections, a transformer for each of said sections, a source of alternating electric power, circuit means including the secondary of each said transformer and also the associated section of said conductive body for passing an electric current along the length of said section, said circuit means further including the primary of the transformer for the next said section more remote from said source for energizing said primary with the current passing through the associated section, each said transformer providing across its secondary winding substantially the same predetermined voltage, said transformer secondaries further providing different respective current amplitudes with each such secondary for a section of said conductive body nearer said source providing a current amplitude greater than that provided for the next more remote section, and means for providing different electrical resistances for the respective said circuit means associated with said transformer secondaries to provide a predetermined heat output per unit length for each said section.
Claim 3
Dependent Claim
115 words
The heat generating apparatus of claim 1 wherein each said section of said conDuctive body comprises a section of ferromagnetic pipe, said circuit means including an insulated electric wire passing through the inside of the respective associated pipe section, the end of said wire nearer said source being connected through the secondary of the transformer associated with the respective section to the end of the pipe nearer said source and the other end of said wire being connected through the primary of the transformer associated with the next more remote section to the other end of said pipe, the wall thickness of said pipe being greater than twice the skin depth of the alternating current.
Claim 4
Dependent Claim
60 words
A heat-generating apparatus according to claim 2, wherein the ferromagnetic pipe, in at least one section other than the section remotest from said a.c. source, is short circuited by a conductor passing through the inside of said ferromagnetic pipe and connected to the opposite ends of said pipe to provide thereby said means providing different electrical resistance for said sections.
Claim 5
Dependent Claim
42 words
A heat-generating apparatus according to claim 3, wherein the insulated wire passing through the inside of the ferromagnetic pipe in at least one section has a metallic tape shield thereon and the metallic tape shield is utilized as the short circuiting conductor.
Claim 6
Dependent Claim
50 words
A heat-generating apparatus according to claim 3, wherein the short circuiting conductor comprises an electrically conductive metal which is melt-filled inside said ferromagnetic pipe, said metal having a melting temperature at which the insulation of the insulated electric wire passing through the inside of the ferromagnetic pipe is not damaged.
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) | 1976-08-27 | 1977-02-26 | 1977-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-27 | 1981-02-26 | 1981-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-27 | 1985-02-26 | 1985-08-28 | $7700.00 | Window Closed / Lapsed |