Patent US5493467A successfully refreshed from Google Patents.
Patent US4932755A successfully refreshed from Google Patents.
US4932755A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical transparency having an electromagnetic pulse shield
Assignee: GKN Aerospace Transparency Systems Inc
•
Filing: 1988-10-12
•
Granted: 1990-06-12
•
Expires: 2008-10-12
Abstract
Abstract An optical transparency adapted to substantially attenuate electromagnetic pulses incident on it, yet transmit visible light with minimal distraction being caused by Fraunhofer diffraction. The transparency includes a transparent sheet and a laminated, electrically-conductive grid that defines a densely-packed array of apertures. Each aperture is a modified polygon having multiple curved sides, such that visible light from a remote point source of light is diffracted by the curved sides of each aperture over multiple, diverging, fan-like areas and minimal distraction to a person viewing through the transparency is thereby provided.
Inventors
- 👤 David W. Holdridge
- 👤 Duane S. Dewald
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 14:44
CPC Classifications
B; B64; B64C; B64C1/00; B64C1/14; B64C1/1476; H; H01; H01Q; H01Q15/00; H01Q15/0006; H01Q15/0013
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
93 words
An optical transparency adapted to attenuate an impinging electromagnetic pulse, yet transmit visible light with negligible distraction being caused by Fraunhofer diffraction, the optical transparency comprising: a transparent sheet; and an electrically-conductive grid laminated with the transparent sheet and including electrical conductors of substantially uniform width that define a densely-packed array of apertures, each aperture being a modified polygon having multiple curved sides; wherein the electrically-conductive grid substantially attenuates any electromagnetic pulse impinging on the transparency, yet transmits a substantial proportion of incident visible light, with negligible distraction being caused by Fraunhofer diffraction.
Claim 2
Dependent Claim
93 words
An optical transparency adapted to attenuate an impinging electromagnetic pulse, yet transmit visible light with negligible distraction being caused by Fraunhofer diffraction, the optical transparency comprising: a transparent sheet; and an electrically-conductive grid laminated with the transparent sheet and including electrical conductors of substantially uniform width that define a densely-packed array of apertures, each aperture being a modified polygon having multiple curved sides; wherein the electrically-conductive grid substantially attenuates any electromagnetic pulse impinging on the transparency, yet transmits a substantial proportion of incident visible light, with negligible distraction being caused by Fraunhofer diffraction.
Claim 3
Dependent Claim
20 words
An optical transparency as defined in claim 1, wherein the apertures defined by the electrically-conductive grid all have three sides.
Claim 4
Dependent Claim
20 words
An optical transparency as defined in claim 1, wherein the apertures defined by the electrically-conductive grid all have four sides.
Claim 5
Dependent Claim
28 words
An optical transparency as defined in claim 1, wherein the apertures defined by the electrically-conductive grid all have six sides and are substantially identical in shape and area.
Claim 6
Dependent Claim
25 words
An optical transparency as defined in claim 4, wherein the apertures defined by the electrically-conductive grid all have sides that are alternatively convex and concave.
Claim 7
Dependent Claim
24 words
An optical transparency as defined in claim 1, wherein the apertures defined by the electrically-conductive grid all have substantially the same shape and area.
Claim 8
Dependent Claim
26 words
An optical transparency as defined in claim 1, wherein the apertures defined by the electrically-conductive grid all have multiple curved sides, including just a single arc.
Claim 9
Dependent Claim
31 words
An optical transparency as defined in claim 1, wherein the electrically-conductive grid is sized to transmit through its apertures at least about 95 percent of visible light incident on the grid.
Claim 10
Dependent Claim
85 words
For use in laminated aircraft transparency, an electromagnetic pulse shield that transmits visible light with negligible distraction being caused by Fraunhofer diffraction, the electromagnetic pulse shield comprising: an electrically-conductive grid including electrical conductors of substantially uniform width that define a densely-packed array of apertures, each aperture being a polygon modified to have multiple curved sides; wherein the electrically-conductive grid substantially attenuates any electromagnetic pulse impinging on the transparency, yet transmits a substantial proportion of incident visible light, with negligible distraction being caused by Fraunhofer diffraction.
Claim 11
Dependent Claim
85 words
For use in laminated aircraft transparency, an electromagnetic pulse shield that transmits visible light with negligible distraction being caused by Fraunhofer diffraction, the electromagnetic pulse shield comprising: an electrically-conductive grid including electrical conductors of substantially uniform width that define a densely-packed array of apertures, each aperture being a polygon modified to have multiple curved sides; wherein the electrically-conductive grid substantially attenuates any electromagnetic pulse impinging on the transparency, yet transmits a substantial proportion of incident visible light, with negligible distraction being caused by Fraunhofer diffraction.
Claim 12
Dependent Claim
21 words
An electromagnetic pulse shield as defined in claim 9, wherein the apertures defined by the electrically-conductive grid all have three sides.
Claim 13
Dependent Claim
21 words
An electromagnetic pulse shield as defined in claim 9, wherein the apertures defined by the electrically-conductive grid all have four sides.
Claim 14
Dependent Claim
29 words
An electromagnetic pulse shield as defined in claim 9, wherein the apertures defined by the electrically-conductive grid all have six sides and are substantially identical in shape and area.
Claim 15
Dependent Claim
26 words
An electromagnetic pulse shield as defined in claim 12, wherein the apertures defined by the electrically-conductive grid all have sides that are alternatively convex and concave.
Claim 16
Dependent Claim
25 words
An electromagnetic pulse shield as defined in claim 9, wherein the apertures defined by the electrically-conductive grid all have substantially the same shape and area.
Claim 17
Dependent Claim
28 words
An electromagnetic pulse shield as defined in claim 9, wherein the apertures defined by the electrically-conductive grid all have multiple curved sides, each including just a single arc.
Claim 18
Dependent Claim
32 words
An electromagnetic pulse shield as defined in claim 9, wherein the electrically-conductive grid is sized to transmit through its apertures at least about 95 percent of visible light incident on the grid.
References Cited (Backward Citations)
US3389951A
Cited
US3265804A
Cited
US4323946A
Cited
US4435465A
Cited
US4412255A
Cited
US4631214A
Cited
US4731500A
Cited
US4684762A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-06-11 | 1993-12-11 | 1994-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-06-11 | 1997-12-11 | 1998-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-06-11 | 2001-12-11 | 2002-06-12 | $7700.00 | Window Closed / Lapsed |