Patent US4323946A successfully refreshed from Google Patents.
US4323946A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for reducing electrostatic charge storage and EMI on dielectric surfaces
Assignee: Individual
•
Filing: 1979-09-20
•
Granted: 1982-04-06
•
Expires: 1999-09-20
Abstract
Abstract Passive and active devices reduce stored electrostatic charge levels on dielectric surfaces, while at the same time reducing electromagnetic interference due to streamer currents, by means of appropriately applied conductors, use of direct or alternating current power sources, ion flooding, fluid flooding and boundry layer control. In addition, the devices detect the presence, polarity and magnitude of triboelectric charging or stored charges on a dielectric surface for the purpose of signalling or of controlling active charge reduction devices. Moreover, the devices can be used to discourage lightning strikes. The devices can be applied with little if any impairment to optical or radio frequency energy transmission or reception.
Inventors
- 👤 Robert L. Traux
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 17:22
CPC Classifications
B; B64; B64D; B64D45/00; B64D45/02; H; H05; H05F; H05F3/00
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
119 words
Apparatus for reducing residual electrostatic charge levels on an exposed dielectric surface of an aircraft body, the apparatus comprising: a plurality of small diameter charge collection conductors projecting through the body and terminating at least adjacent to the dielectric surface for collecting around the charge collection conductors electrostatic charges accumulated on the surface; conductive connecting means electrically connected to the charge collection conductors and disposed behind the dielectric surface for conducting the charges collected around the charge collection conductors away from the dielectric surface, and a conductive air frame disposed adjacent to the dielectric surface and connected to the conductive connecting means for grounding the electrostatic charges conducted through to the conductive connecting means by the charge collecting conductors.
Claim 2
Dependent Claim
119 words
Apparatus for reducing residual electrostatic charge levels on an exposed dielectric surface of an aircraft body, the apparatus comprising: a plurality of small diameter charge collection conductors projecting through the body and terminating at least adjacent to the dielectric surface for collecting around the charge collection conductors electrostatic charges accumulated on the surface; conductive connecting means electrically connected to the charge collection conductors and disposed behind the dielectric surface for conducting the charges collected around the charge collection conductors away from the dielectric surface, and a conductive air frame disposed adjacent to the dielectric surface and connected to the conductive connecting means for grounding the electrostatic charges conducted through to the conductive connecting means by the charge collecting conductors.
Claim 3
Dependent Claim
31 words
The apparatus of claim 1 where the dielectric surface is on a windshield of an aircraft and the conductive frame is at least a portion of the airframe of the aircraft.
Claim 4
Dependent Claim
31 words
The apparatus of claim 1 wherein the dielectric surface is on a canopy of an aircraft and the conductive frame is at least a portion of the airframe of the aircraft.
Claim 5
Dependent Claim
33 words
The apparatus of claim 1 wherein the dielectric surface is on an exposed surface of an aircraft and wherein the conductive frame is at least a portion of the airframe of the aircraft.
Claim 6
Independent Claim
22 words
The apparatus of claims 1, 2, 3 or 4 wherein the plurality of charge collection conductors terminate slightly beneath the dielectric surface.
Claim 7
Independent Claim
31 words
The apparatus of claims 1, 2, 3 or 4 wherein the charge collection conductors have a diameter less than approximately twenty-five micrometers to minimize optical interference should the dielectric be transparent.
Claim 8
Independent Claim
24 words
The apparatus of claims 1, 2, 3 or 4 wherein the charge collection conductors are formed of conductive plastic having a relatively high resistivity.
Claim 9
Independent Claim
46 words
The apparatus of claims 1, 2, 3 or 4 wherein the body has holes therein for receiving the charge collection conductors and wherein the charge collection conductors are formed of conductive plastic having a relatively high resistivity and are inserted into the holes by capillary action.
Claim 10
Independent Claim
20 words
The apparatus of claims 1, 2, 3 or 4 wherein the conductive connecting means is a layer of conductive material.
Claim 11
Independent Claim
21 words
The apparatus of claims 1, 2, 3 or 4 wherein the conductive connecting means is a grid made of conductive material.
Claim 12
Independent Claim
26 words
The apparatus of claims 1, 2, 3 or 4 wherein the body is a laminate and the conductive connecting means is disposed between the layers thereof.
Claim 13
Independent Claim
38 words
The apparatus of claims 1, 2, 3 or 4 further including means for active electric field enhancement wherein said means includes a power supply circuit electrically connected to the charge collection conductors thereby further reducing residual electrostatic charges.
Claim 14
Independent Claim
94 words
The apparatus of claims 1, 2, 3 or 4 further comprising: direct current power supply means electrically connected to the charge collecting conductors, the direct current power supply means including means for applying selectively positive and negative potentials to the charge collecting conductors; means for determing the polarity and magnitude of the electrostatic charge, and means for switching the power supply to apply a positive potential to the charge collecting conductors if the residual electrical charge is negative and a negative potential to the charge collecting conductors if the residual electrostatic charge is positive.
Claim 15
Independent Claim
58 words
The apparatus of claims 1, 2, 3 or 4 further comprising an alternating current power supply electrically connected to the charge collection conductors; means for determing the polarity and magnitude of the electrostatic charge on the dielectric surface, and comparitor means for activating the alternating current power supply to reduce the residual electrostatic charges on the dielectric surface.
Claim 16
Independent Claim
38 words
The apparatus of claims 1, 2, 3 or 4 wherein the charge collecting conductors have diameters in the range of approximately one to twenty-five microns and are spaced distances in the range of five to twenty centimeters apart.
Claim 17
Dependent Claim
99 words
Apparatus for reducing residual electrostatic charge levels on a dielectric body having a dielectric surface exposed to a stream of air wherein the body is supported by a conductive frame, the apparatus comprising: a plurality of small diameter charge collection conductors projecting through the dielectric body and terminating at least adjacent to the dielectric surface for collecting therearound electrostatic charges accumulated on the dielectric surface; conductive connecting means electrically connected to the charge collection conductors and to the conductive frame for conducting charges collected around the charge collection conductors away from the dielectric surface and to the conductive frame.
Claim 18
Dependent Claim
99 words
Apparatus for reducing residual electrostatic charge levels on a dielectric body having a dielectric surface exposed to a stream of air wherein the body is supported by a conductive frame, the apparatus comprising: a plurality of small diameter charge collection conductors projecting through the dielectric body and terminating at least adjacent to the dielectric surface for collecting therearound electrostatic charges accumulated on the dielectric surface; conductive connecting means electrically connected to the charge collection conductors and to the conductive frame for conducting charges collected around the charge collection conductors away from the dielectric surface and to the conductive frame.
Claim 19
Dependent Claim
36 words
The apparatus of claim 16 further including means for reducing surface stagnation adjacent the dielectric surface due to boundary layer effects, wherein said surface stagnation means includes means for flooding the dielectric surface with a fluid.
Claim 20
Independent Claim
32 words
The apparatus of claims 16 or 17 further including means adjacent the dielectric surface for flooding the dielectric surface with ions of a polarity opposite the polarity of the electrostatic charge level.
Claim 21
Dependent Claim
123 words
Apparatus for reducing residual electrostatic charge levels on an exterior dielectric surface of an aircraft canopy made of a dielectric material, the apparatus comprising: a plurality of small diameter charge collection conductors projecting into the canopy and terminating at least adjacent to the exterior surface thereof for collecting around the charge collection conductors electrostatic charges accumulated on the surface; a conductive grid electrically connected to the charge collection conductors and disposed behind the exterior surface for conducting the charges collected around the charge collection conductors away from the exterior surface, and a conductive air frame disposed adjacent to the dielectric exterior surface and connected to the conductive grid for grounding the electrostatic charges conducted through to the grid by the charge collecting conductors.
Claim 22
Dependent Claim
123 words
Apparatus for reducing residual electrostatic charge levels on an exterior dielectric surface of an aircraft canopy made of a dielectric material, the apparatus comprising: a plurality of small diameter charge collection conductors projecting into the canopy and terminating at least adjacent to the exterior surface thereof for collecting around the charge collection conductors electrostatic charges accumulated on the surface; a conductive grid electrically connected to the charge collection conductors and disposed behind the exterior surface for conducting the charges collected around the charge collection conductors away from the exterior surface, and a conductive air frame disposed adjacent to the dielectric exterior surface and connected to the conductive grid for grounding the electrostatic charges conducted through to the grid by the charge collecting conductors.
Claim 23
Dependent Claim
123 words
Apparatus for reducing residual electrostatic charge levels on an exterior dielectric surface of an aircraft windshield made of a dielectric material, the apparatus comprising: a plurality of small diameter charge collection conductors projecting into the windshield and terminating at least adjacent to the exterior surface thereof for collecting around the charge collection conductors electrostatic charges accumulated on the surface; a conductive grid electrically connected to the charge collection conductors and disposed behind the exterior surface for conducting the charges collected around the charge collection conductors away from the exterior surface, and a conductive air frame disposed adjacent to the dielectric exterior surface and connected to the conductive grid for grounding the electrostatic charges conducted through to the grid by the charge collecting conductors.
Claim 24
Dependent Claim
123 words
Apparatus for reducing residual electrostatic charge levels on an exterior dielectric surface of an aircraft windshield made of a dielectric material, the apparatus comprising: a plurality of small diameter charge collection conductors projecting into the windshield and terminating at least adjacent to the exterior surface thereof for collecting around the charge collection conductors electrostatic charges accumulated on the surface; a conductive grid electrically connected to the charge collection conductors and disposed behind the exterior surface for conducting the charges collected around the charge collection conductors away from the exterior surface, and a conductive air frame disposed adjacent to the dielectric exterior surface and connected to the conductive grid for grounding the electrostatic charges conducted through to the grid by the charge collecting conductors.
References Cited (Backward Citations)
US3289060A
Cited
US2323461A
Cited
US2539163A
Cited
US3428270A
Cited
US3427504A
Cited
US3600632A
Cited
US3572609A
Cited
US3733038A
Cited
US3755713A
Cited
US3802625A
Cited
US3857066A
Cited
US3906308A
Cited
US3989984A
Cited
US4005357A
Cited
US4078107A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-04-05 | 1985-10-05 | 1986-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-04-05 | 1989-10-05 | 1990-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-04-05 | 1993-10-05 | 1994-04-06 | $7700.00 | Window Closed / Lapsed |