US4383942A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus and method for enhancing electrical conductivity of conductive composites and products thereof
Assignee: BAE Systems Integrated Defense Solutions Inc
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Filing: 1980-01-21
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Granted: 1983-05-17
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Expires: 2000-01-21
Abstract
Abstract Apparatus and method for enhancing the electrical conductivity of conductive composite materials and the product of the process are disclosed. An electric current is caused to flow in the composite to drive down the resistivity to levels of 10 ohm-cm or less.
Inventors
- 👤 Donald E. Davenport
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 07:45
CPC Classifications
H; H03; H03K; H03K3/00; H03K3/02; H03K3/53
Claims Analysis
Total Claims: 48
Claim 1
Independent Claim
133 words
A method of increasing the conductivity of a plurality of articles, each article substantially identically shaped and is of a composite material containing at least 5% electrically conductive additives by volume dispersed throughout the composite material, said method comprising, attaching connectors in pairs to sets of selected locations in the surface of said material, passing at least one electrical pulse through the pair of connectors and composite material at each set of selected locations, measuring the resistance of said composite material at each set of selected locations, adjusting the parameters of energy and of the number of electrical pulses at each set of selected locations to optimize the conductivity of said composite material, and selecting the optimized parameters to increase the conductivity of subsequently treated substantially identically shaped articles of said composite material.
Claim 2
Independent Claim
133 words
A method of increasing the conductivity of a plurality of articles, each article substantially identically shaped and is of a composite material containing at least 5% electrically conductive additives by volume dispersed throughout the composite material, said method comprising, attaching connectors in pairs to sets of selected locations in the surface of said material, passing at least one electrical pulse through the pair of connectors and composite material at each set of selected locations, measuring the resistance of said composite material at each set of selected locations, adjusting the parameters of energy and of the number of electrical pulses at each set of selected locations to optimize the conductivity of said composite material, and selecting the optimized parameters to increase the conductivity of subsequently treated substantially identically shaped articles of said composite material.
Claim 3
Independent Claim
68 words
A method for increasing the conductivity of a conductive resinous composite material containing at least 5% electrically conductive additives by volume dispersed throughout the composite material comprising discharging at least one short high voltage pulse through at least a portion of said material, said pulse having a discharge time constant of 10 microseconds or less, whereby current paths among said conductive additives are increased in number and enhanced.
Claim 4
Independent Claim
68 words
A method for increasing the conductivity of a conductive resinous composite material containing at least 5% electrically conductive additives by volume dispersed throughout the composite material comprising discharging at least one short high voltage pulse through at least a portion of said material, said pulse having a discharge time constant of 10 microseconds or less, whereby current paths among said conductive additives are increased in number and enhanced.
Claim 5
Dependent Claim
21 words
The method of claim 2 wherein said conductive additives comprise conductive fibers having a range of diameters 0.1 to 10 mils.
Claim 6
Dependent Claim
23 words
The method of claim 2 wherein the conductive additives comprise metal ribbon having a length in the order of 0.050 inches or longer.
Claim 7
Dependent Claim
20 words
The method of claim 3 wherein the conductive fibers have a length in the order of 0.050 inches or longer.
Claim 8
Dependent Claim
13 words
The method of claim 3 wherein the conductive fibers are metallized glass fibers.
Claim 9
Dependent Claim
16 words
The method of claim 6 wherein the metallized glass fibers are substantially fully coated with aluminum.
Claim 10
Dependent Claim
20 words
The method of claim 6 wherein a portion of the peripheries of the metallized glass fibers are coated with aluminum.
Claim 11
Dependent Claim
17 words
The method of claim 4 wherein the percentage by volume of electrically conductive ribbon ranges to 40%.
Claim 12
Dependent Claim
19 words
The method of claim 2 wherein the resinous composite material comprises plastics from the group of thermoplastics and thermosets.
Claim 13
Dependent Claim
17 words
The method of claim 2 wherein the percentage by volume of electrically conductive additives ranges to 40%.
Claim 14
Dependent Claim
19 words
The method of claim 6 wherein the resinous composite further includes nonmetallized glass fibers dispersed throughout the composite material.
Claim 15
Dependent Claim
19 words
The method of claim 7 wherein the resinous composite further includes nonmetallized glass fibers dispersed throughout the composite material.
Claim 16
Dependent Claim
28 words
The method of claim 2 wherein the composite material comprises at least 5% by volume electrically conductive additives from the group of metals, metallized glass fibers and carbon.
Claim 17
Dependent Claim
22 words
The method of claim 1 wherein the composite material comprises materials from the group of thermoplastics, thermosets, ceramics, woods, concretes and plasters.
Claim 18
Dependent Claim
8 words
The product of the process of claim 2.
Claim 19
Dependent Claim
8 words
The product of the process of claim 3.
Claim 20
Dependent Claim
8 words
The product of the process of claim 5.
Claim 21
Dependent Claim
8 words
The product of the process of claim 6.
Claim 22
Dependent Claim
8 words
The product of the process of claim 7.
Claim 23
Dependent Claim
8 words
The product of the process of claim 8.
Claim 24
Dependent Claim
8 words
The product of the process of claim 4.
Claim 25
Dependent Claim
8 words
The product of the process of claim 9.
Claim 26
Dependent Claim
8 words
The product of the process of claim 10.
Claim 27
Dependent Claim
8 words
The product of the process of claim 11.
Claim 28
Dependent Claim
8 words
The product of the process of claim 12.
Claim 29
Dependent Claim
8 words
The product of the process of claim 13.
Claim 30
Dependent Claim
8 words
The product of the process of claim 14.
Claim 31
Dependent Claim
8 words
The product of the process of claim 15.
Claim 32
Independent Claim
58 words
A method for increasing the conductivity of a conductive resinous composite material containing at least 5% electrically conductive additives by volume dispersed throughout the composite material comprising passing at least one short high voltage alternating current pulse through at least a portion of said material, whereby current paths among said conductive additives are increased in number and enhanced.
Claim 33
Independent Claim
58 words
A method for increasing the conductivity of a conductive resinous composite material containing at least 5% electrically conductive additives by volume dispersed throughout the composite material comprising passing at least one short high voltage alternating current pulse through at least a portion of said material, whereby current paths among said conductive additives are increased in number and enhanced.
Claim 34
Dependent Claim
21 words
The method of claim 30 wherein said conductive additives comprise conductive fibers having a range of diameters 0.1 to 10 mils.
Claim 35
Dependent Claim
20 words
The method of claim 30 wherein the conductive fibers have a length in the order of 0.050 inches or longer.
Claim 36
Dependent Claim
13 words
The method of claim 32 wherein the conductive fibers are metallized glass fibers.
Claim 37
Dependent Claim
23 words
The method of claim 30 wherein the conductive additives comprise metal ribbon having a length in the order of 0.050 inches or longer.
Claim 38
Dependent Claim
11 words
The method of claim 34 wherein the metal ribbon is aluminum.
Claim 39
Dependent Claim
17 words
The method of claim 30 wherein the percentage by volume of electrically conductive additives ranges to 40%.
Claim 40
Dependent Claim
19 words
The method of claim 33 wherein the resinous composite further includes nonmetallized glass fibers dispersed throughout the composite material.
Claim 41
Dependent Claim
8 words
The product of the process of claim 30.
Claim 42
Dependent Claim
8 words
The product of the process of claim 31.
Claim 43
Dependent Claim
8 words
The product of the process of claim 32.
Claim 44
Dependent Claim
8 words
The product of the process of claim 33.
Claim 45
Dependent Claim
8 words
The product of the process of claim 34.
Claim 46
Dependent Claim
8 words
The product of the process of claim 35.
Claim 47
Dependent Claim
8 words
The product of the process of claim 36.
Claim 48
Dependent Claim
8 words
The product of the process of claim 37.
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) | 1986-05-16 | 1986-11-15 | 1987-05-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-05-16 | 1990-11-15 | 1991-05-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-05-16 | 1994-11-15 | 1995-05-17 | $7700.00 | Window Closed / Lapsed |