US5077461A
Expired / Lapsed
US
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Far-infra-red heater
Assignee: Tokai Konetsu Kogyo Co Ltd
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Filing: 1989-11-09
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Granted: 1991-12-31
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Expires: 2009-11-09
Abstract
Abstract A far infra-red heater comprises a resistance heating element composed of an insulating and heat resistance structural material and 5 to 60% by weight of Si or FeSi as a conductive material dispersed in the structural material. In the far infra-red radiating heater, a ceramic resistance heating element per se efficiently radiates light having a wave length falling within the far infra-red region, the heater has high thermal efficiency and sufficient mechanical strength and can be used at a temperature of up to about 600° C.
Inventors
- 👤 Nobuyuki Hasegawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:13
CPC Classifications
H; H05; H05B; H05B3/00; H05B3/40; H05B3/42; H05B3/44; H05B3/10; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2927; Y10T428/31504; Y10T428/31652; Y10T428/31663
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
37 words
A far infra-red heater comprising a resistance heating element composed of an insulating and heat resistant structural material and 5 to 60% by weight of Si or FeSi as a conductive material dispersed in the structural material.
Claim 2
Dependent Claim
37 words
A far infra-red heater comprising a resistance heating element composed of an insulating and heat resistant structural material and 5 to 60% by weight of Si or FeSi as a conductive material dispersed in the structural material.
Claim 3
Dependent Claim
21 words
The far infra-red heater of claim 1 wherein it further comprises an insulating glass protective layer on the resistance heating element.
Claim 4
Dependent Claim
22 words
The far infra-red heater of claim 1 wherein the insulating and heat resistant structural material is a material principally comprising an aluminosilicate.
Claim 5
Dependent Claim
30 words
The far infra-red heater of claim 1 wherein the insulating and heat resistant structural material is selected from those capable of being sintered at a temperature less than 1410° C.
Claim 6
Dependent Claim
134 words
The far infra-red heater of claim 4 wherein the insulating and heat resistant structural material is selected from the group consisting of (i) ZrO 2 . TiO 2 type glasses; (ii) Al 2 O 3 . TiO 2 type glasses; (iii) TiO 2 type glasses containing not less than 90% of TiO 2 and not more than 10% of Cr 2 O 3 ; (iv) Fe 2 O 3 . SiO 2 type glasses; (v) a mixture of at least one member selected from the group consisting of oxides, carbides and nitrides of elements of Group II and III of the Periodic Table with at least one member selected from the group consisting of oxides, carbides and nitrides of elements of Group IV and V of the Periodic Table; and (vi) SiC type ones.
Claim 7
Dependent Claim
80 words
The far infra-red heater of claim 1 wherein the insulating and heat resistant structural materials principally comprising aluminosilicate contains 0.5 to 30% of at least one metal oxide selected from the group consisting of Fe 2 O 3 , Cr 2 O 3 , Mn 2 O 3 , ZrO 2 , TiO 2 , MnO 2 , Li 2 O, Cao, MgO, NiO, CoO and Cu 2 O in addition to Al 2 O 3 and SiO 2 .
Claim 8
Dependent Claim
40 words
The far infra-red heater of claim 1 wherein the insulating and heat resistant structural material is a member selected from the group consisting of KIBUSHI clay, GAIROME clay, kaolin, AMAKUSA pottery stone, potash feld spar, pyroferrite, bentonite, petalite and talc.
Claim 9
Dependent Claim
19 words
The far infra-red heater of claim 1 wherein the insulating and heat resistant structural material further comprises glass components.
Claim 10
Dependent Claim
61 words
The far infra-red heater of claim 8 wherein the glass components is selected from the group consisting of SiO 2 type glasses, SiO 2 -Al 2 O 3 type glasses, SiO 2 -B 2 O 3 type glasses, SiO 2 -Li 2 O type glasses, SiO 2 -ZnO type glasses and crystalline glasses which are converted into a ceramic after calcination.
Claim 11
Dependent Claim
41 words
The far infra-red heater of claim 8 wherein the glass component is selected from the group consisting of 1) SiO 2 type glasses; 2) SiO 2 -B 2 O 3 type glasses; 3) SiO 2 -Al 2 O 3 type glasses.
Claim 12
Dependent Claim
103 words
The far infra-red heater of claim 8 wherein the crystalline glass is selected from the group consisting of 1) LiO 2 -SiO 2 type glasses containing SiO 2 65˜81%; Li 2 O 7˜15%; and Al 2 O 3 4˜20%; 2) ZnO-SiO 2 type glasses containing SiO 2 44˜51%; ZnO 19˜26%; and Al 2 O 3 17˜23%; 3) MgO-Al 2 O 3 -SiO 2 type glasses containing SiO 2 43˜64%; MgO 13˜25%; and Al 2 O 3 14˜31%; and 4) Li 2 O-Al 2 O 3 -SiO 2 type glasses containing SiO 2 59˜70%; Li 2 O 3˜4%; and Al 2 O 3 12˜15%.
Claim 13
Dependent Claim
39 words
The far infra-red heater of claim 8 wherein the amount of the glass component to be incorporated into the structural materials ranges from 10 to 50% by weight on the basis of the total weight of the structural material.
Claim 14
Dependent Claim
65 words
The far infra-red heater of claim 8 wherein the structural materials is selected from the group consisting of: 1) KIBUSHI clay 70% and borosilicate glass 30%; 2) GAIROME clay 70% and feld spar 30%; 3) alumina 30%, KIBUSHI clay 30% and aluminosilicate glass 40%; 4) kaolin 60%, KIBUSHI clay 15%, talc 15% and magnesite 10%; and 5) petalite 75%, lithium carbonate 15% and alumina 10%.
Claim 15
Dependent Claim
23 words
The far infra-red heater of claim 1 wherein the resistance of the resistance heating element ranges from 10 -2 to 10 1 Ω·cm.
Claim 16
Dependent Claim
34 words
The far infra-red heater of claim 1 wherein it radiates far infra-red rays having a wave length ranging from 3 to 50 μ and is used at a temperature of up to 600° C.
Claim 17
Independent Claim
63 words
A method for generating far infra-red rays, which comprises applying electric voltage to a heater comprising a resistance heating element composed of an insulating and heat resistant structural material and 5 to 60% by weight of Si or FeSi as a conductive material dispersed in the structural material to thereby heat the surface of the heat temperature of 200° C. to 600° C.
Claim 18
Independent Claim
63 words
A method for generating far infra-red rays, which comprises applying electric voltage to a heater comprising a resistance heating element composed of an insulating and heat resistant structural material and 5 to 60% by weight of Si or FeSi as a conductive material dispersed in the structural material to thereby heat the surface of the heat temperature of 200° C. to 600° C.
Claim 19
Dependent Claim
19 words
The method claim 16 wherein the heater further comprises an insulating glass protective layer on the resistance heating element.
Claim 20
Dependent Claim
132 words
The method of claim 16 wherein the insulating and heat resistant structural material is selected from the group consisting of (i) ZrO 2 . TiO 2 type glasses; (ii) Al 2 O 3 . TiO 2 type glasses; (iii) TiO 2 type glasses containing not less than 90% of TiO 2 and not more than 10% of Cr 2 O 3 ; (iv) Fe 2 O 3 . SiO 2 type glasses; (v) a mixture of at least one member selected from the group consisting of oxides, carbides and nitrides of elements of Group II and III of the Periodic Table with at least one member selected from the group consisting of oxides, carbides and nitrides of elements of Group IV and V of the Periodic Table; and (vi) SiC type ones.
Claim 21
Independent Claim
51 words
An apparatus for generating far infra-red rays, which comprises a resistance heating element composed of an insulating and heat resistant structural material and 5 to 60% by weight of Si or FeSi as a conductive material dispersed in the structural material and electrodes provided on the both ends of the element.
Claim 22
Independent Claim
51 words
An apparatus for generating far infra-red rays, which comprises a resistance heating element composed of an insulating and heat resistant structural material and 5 to 60% by weight of Si or FeSi as a conductive material dispersed in the structural material and electrodes provided on the both ends of the element.
Claim 23
Dependent Claim
15 words
The apparatus of claim 19, wherein the element is in the form of a bar.
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) | 1994-12-30 | 1995-07-01 | 1995-12-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-12-30 | 1999-07-01 | 1999-12-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-12-30 | 2003-07-01 | 2003-12-31 | $7700.00 | Window Closed / Lapsed |