US5609891A
Expired / Lapsed
US
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Method to treat materials by microwave
Assignee: Renault SA
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Filing: 1995-06-07
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Granted: 1997-03-11
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Expires: 2015-06-07
Abstract
Abstract A device for microwave treatment of materials includes a mold (1) used to hold the material (3) to be treated and a microwave generator which is used to apply to the mold (1) the microwave energy necessary for treatment of the material. The mold includes at least two dielectric materials (4,5,6,7) surrounding the material (3) to be treated. The dielectric materials have dielectric permittivities which differ so that the attenuation of one elementary segment of length l located between the points of side z(n-1) and zn of the longitudinal dimension of the material (3) to be treated which includes at least one section broken up into segments of length l, is controlled by the relationship: <IMAGE> in which: alpha is the attenuation in the elementary segment in question, alpha o is the initial attenuation in the body of the section which includes the elementary segment in question, Po is the microwave power applied to the section, P(n-1) is the microwave power transmitted in the plane of side z(n-1).
Inventors
- 👤 Didier Delaunay
- 👤 Henri Jullien
- 👤 Claude More
- 👤 Lhoussain Outifa
- 👤 Michel Delmotte
- 👤 Bernard Maestrali
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:27
CPC Classifications
B; B29; B29C; B29C33/00; B29C33/02; B29C33/06; H; H05; H05B; H05B6/00; H05B6/64; H05B6/80
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
170 words
Device for microwave treatment of materials other than a mass of metal materials, comprising a mold for holding the material to be treated and at least one microwave generator for applying the microwave energy necessary for treatment of the material in the mold the mold including at least two dielectric materials which surround the material to be treated, wherein the dielectric materials have dielectric permittivities which differ from one another so that the attenuation of one elementary segment of length l located between the points of side z(n-1) and zn of the longitudinal dimension of the material to be treated, which includes at least one section broken up into segments of length l, is controlled by the relationship ##EQU5## in which: α is the attenuation in the elementary segment in question, αo is the initial attenuation in the body of the section which includes the elementary segment in question, Po is the microwave power applied to the section, P(n-1) is the microwave power transmitted in the plane of side z(n-1).
Claim 2
Dependent Claim
170 words
Device for microwave treatment of materials other than a mass of metal materials, comprising a mold for holding the material to be treated and at least one microwave generator for applying the microwave energy necessary for treatment of the material in the mold the mold including at least two dielectric materials which surround the material to be treated, wherein the dielectric materials have dielectric permittivities which differ from one another so that the attenuation of one elementary segment of length l located between the points of side z(n-1) and zn of the longitudinal dimension of the material to be treated, which includes at least one section broken up into segments of length l, is controlled by the relationship ##EQU5## in which: α is the attenuation in the elementary segment in question, αo is the initial attenuation in the body of the section which includes the elementary segment in question, Po is the microwave power applied to the section, P(n-1) is the microwave power transmitted in the plane of side z(n-1).
Claim 3
Dependent Claim
33 words
Device according to claim 1, wherein for a section which is broken up into segments of the same length l, the attenuation of the n th segment is controlled by the relationship: ##EQU6##
Claim 4
Dependent Claim
58 words
Device according to either of claims 1 and 2, wherein said dielectric materials form a stack which fills a waveguide of the mold and includes peripheral layers of dielectric material which have a certain permittivity, and of other layers of the dielectric material which have increased permittivity, that are located in contact with the material to be treated.
Claim 5
Dependent Claim
34 words
Device according to claim 3, wherein the layers of the dielectric material which fill the mold focus the waves in the central zone of the mold while their variable section compensates for wave attenuation.
Claim 6
Dependent Claim
45 words
Device according to one of claims 1 or 2, wherein the two dimensions of the transverse section of the stack formed by the layers of dielectric material of the fill material of the mold are variable along the length of the material to be treated.
Claim 7
Dependent Claim
35 words
Device according to one of claims 1 or 2, wherein the mold has a shape which is adjusted to that of the material to be treated at least along the longitudinal dimension of the latter.
Claim 8
Dependent Claim
26 words
Device according to one of claims 1 or 2, wherein the dielectric constants of losses of the dielectric materials are adjusted to the desired attenuation conditions.
Claim 9
Dependent Claim
44 words
Device according to one of claims 1 or 2, further comprising means for placing the material to be treated which is contained in the mold under pressure, and wherein the dielectric materials are materials which are resistant to the application of the mechanical constraint.
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GB759001A
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US4298324A
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FR2571201A1
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FR2632890A1
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FR2650775A1
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2000-03-10 | 2000-09-09 | 2001-03-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-03-10 | 2004-09-09 | 2005-03-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-03-10 | 2008-09-09 | 2009-03-11 | $7700.00 | Window Closed / Lapsed |