US4236109A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dielectric monitored composite assembly
Assignee: Lockheed Martin Corp
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Filing: 1977-12-12
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Granted: 1980-11-25
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Expires: 1997-12-12
Abstract
Abstract A dielectric probe comprising a pair of electrically conductive wires embeddable in or mountable on resin matrix composite materials for monitoring changes in the dielectric property of the composite structure due to moisture content therein, thermal spikes or fatigue degradations experienced thereby.
Inventors
- 👤 Harold R. Ingle, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:44
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/02; G01N27/22; G01N27/223; G01N27/225; G01R; G01R27/00; G01R27/02; G01R27/26; G01R27/2617; G01R27/2635; G01R27/267
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
161 words
A dielectric monitored cured resin matrix composite assembly comprising in combination: a multiple-plied, resin matrix composite structure means in a cured state; and, a dielectric monitoring means including a first and second capacitive plate means each formed of insulation coated wire having a plate portion and at least one end lead, the plate portion of each said wire assembled to the composite structure means whereby at least a portion of the wire insulation throughout the plate portion is in direct physical contact with the composite structure means such that connection of said wire end lead of each of said plate means to an alternating current source produces a measureable electrical capacitance indicative of the existing dielectric value of the composite structure means portion located between said first and second plate means whereby changes in either as well as both moisture content and physical strength level properties of the composite structure means can be determined by changes in the dielectric properties thereof.
Claim 2
Dependent Claim
161 words
A dielectric monitored cured resin matrix composite assembly comprising in combination: a multiple-plied, resin matrix composite structure means in a cured state; and, a dielectric monitoring means including a first and second capacitive plate means each formed of insulation coated wire having a plate portion and at least one end lead, the plate portion of each said wire assembled to the composite structure means whereby at least a portion of the wire insulation throughout the plate portion is in direct physical contact with the composite structure means such that connection of said wire end lead of each of said plate means to an alternating current source produces a measureable electrical capacitance indicative of the existing dielectric value of the composite structure means portion located between said first and second plate means whereby changes in either as well as both moisture content and physical strength level properties of the composite structure means can be determined by changes in the dielectric properties thereof.
Claim 3
Dependent Claim
25 words
An assembly as claimed in claim 1 wherein said first and second plate means are assembled to the composite structure means on opposite sides thereof.
Claim 4
Dependent Claim
29 words
An assembly as claimed in claim 1 wherein at least one of said first and second plate means is located interlamellarly between two plies of the composite structure means.
Claim 5
Dependent Claim
18 words
An assembly as claimed in claim 1 wherein the plate portions of the wires form disc shaped coils.
Claim 6
Dependent Claim
20 words
An assembly as claimed in claim 1 wherein the plate portions of the wires form a bifilar disc shaped coil.
Claim 7
Dependent Claim
21 words
An assembly as claimed in claim 1 wherein the plate portions of the wires form a twisted bifilar disc shaped coil.
Claim 8
Dependent Claim
20 words
An assembly as claimed in claim 1 wherein the plate portions of the wires form a bifilar rectangular layout arrangement.
Claim 9
Dependent Claim
21 words
An assembly as claimed in claim 1 wherein the plate portions of the wires form a twisted bifilar rectangular layout arrangement.
Claim 10
Dependent Claim
20 words
An assembly as claimed in claim 1 wherein the plate portions of the wires extend longitudinally parallel in side-by-side arrangement.
Claim 11
Dependent Claim
25 words
An assembly as claimed in claim 1 wherein the wire insulation comprises a coating from a material group consisting of thermosetting polyester and epoxy enamel.
Claim 12
Dependent Claim
20 words
An assembly as claimed in claim 10 wherein the wire insulation includes a linear amide-imide coating over the first coating.
Claim 13
Dependent Claim
161 words
A dielectric monitored resin matrix composite assembly comprising in combination: a multiple-plied, resin matrix composite means in less than a completely cured state; and, a dielectric monitoring means including a first and second capacitive plate means formed of insulation coated wire having a plate portion and at least one end lead, the plate portion of each said wire assembled to the composite means whereby at least a portion of the wire insulation throughout the plate portion is in direct physical contact with the composite means such that connection of said wire end lead of each of said plate means to an alternating current source produces a measureable electrical capacitance indicative of the existing dielectric value of the composite means portion located between said first and second plate means whereby changes of the molecular structure by converting from a monomer state to a polymer state in the composite means during cure thereof can be determined by changes in the dielectric properties thereof.
Claim 14
Dependent Claim
161 words
A dielectric monitored resin matrix composite assembly comprising in combination: a multiple-plied, resin matrix composite means in less than a completely cured state; and, a dielectric monitoring means including a first and second capacitive plate means formed of insulation coated wire having a plate portion and at least one end lead, the plate portion of each said wire assembled to the composite means whereby at least a portion of the wire insulation throughout the plate portion is in direct physical contact with the composite means such that connection of said wire end lead of each of said plate means to an alternating current source produces a measureable electrical capacitance indicative of the existing dielectric value of the composite means portion located between said first and second plate means whereby changes of the molecular structure by converting from a monomer state to a polymer state in the composite means during cure thereof can be determined by changes in the dielectric properties thereof.
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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) | 1983-11-25 | 1984-05-26 | 1984-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-11-25 | 1988-05-26 | 1988-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-11-25 | 1992-05-26 | 1992-11-25 | $7700.00 | Window Closed / Lapsed |