Patent US4772760A successfully refreshed from Google Patents.
US4772760A
Expired / Lapsed
US
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Nonorthogonal EMP shielding elements
Assignee: PPG Industries Inc
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Filing: 1987-04-28
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Granted: 1988-09-20
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Expires: 2007-04-28
Abstract
Abstract Nonorthogonal grid patterns and curved transparencies having nonorthogonal grid patterns comprising a matrix of interconnected circles and arcs are described for use as electromagnetic pulse shielding elements which diminish "starburst" light interference distortions and readily conform to compound curvatures and complex shapes.
Inventors
- 👤 Charles R. Graham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 13:49
CPC Classifications
H; H05; H05K; H05K9/00; H05K9/0073; H05K9/0094; B; B64; B64C; B64C1/00; B64C1/14; B64C1/1476; G; G01; G01R; G01R1/00; G01R1/02; G01R1/18
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
35 words
A transparent article comprising: (a) a transparent substrate; and (b) a nonorthogonal grid pattern on a surface of said substrate wherein said pattern comprises a series of closed loops, equally spaced and interconnected by arcs.
Claim 2
Dependent Claim
35 words
A transparent article comprising: (a) a transparent substrate; and (b) a nonorthogonal grid pattern on a surface of said substrate wherein said pattern comprises a series of closed loops, equally spaced and interconnected by arcs.
Claim 3
Dependent Claim
16 words
A transparent article according to claim 1, wherein said nonorthogonal grid pattern is a conductive metal.
Claim 4
Dependent Claim
21 words
A transparent article according to claim 2, wherein said conductive metal is selected from the group consisting of nickel and copper.
Claim 5
Dependent Claim
13 words
A transparent article according to claim 3, wherein said conductive metal is copper.
Claim 6
Dependent Claim
23 words
A transparent article according to claim 1, wherein said transparent substrate is selected from the group consisting of glass and rigid transparent plastics.
Claim 7
Dependent Claim
33 words
A transparent article according to claim 5, wherein said transparent substrate comprises a laminate comprising at least one layer of a rigid transparent plastic selected from the group consisting of polycarbonate and acrylic.
Claim 8
Dependent Claim
18 words
A transparent article according to claim 6, wherein said transparent substrate comprises a layer of transparent thermoplastic plastic.
Claim 9
Dependent Claim
22 words
A transparent article according to claim 7, wherein said thermoplastic layer is selected from the group consisting of polyvinyl butyral and polyurethanes.
Claim 10
Dependent Claim
13 words
A transparent article according to claim 5, wherein said transparent plastic is acrylic.
Claim 11
Dependent Claim
13 words
A transparent article according to claim 5, wherein said transparent plastic is polycarbonate.
Claim 12
Dependent Claim
36 words
A transparent article comprising: (a) a curved transparent substrate; and (b) a nonorthogonal grid patern on a surface of said substrate, wherein said pattern comprises a series of closed loops, equally spaced and interconnected by arcs.
Claim 13
Dependent Claim
36 words
A transparent article comprising: (a) a curved transparent substrate; and (b) a nonorthogonal grid patern on a surface of said substrate, wherein said pattern comprises a series of closed loops, equally spaced and interconnected by arcs.
Claim 14
Dependent Claim
16 words
A transparent article according to claim 11, wherein said nonorthogonal grid pattern is a conductive metal.
Claim 15
Dependent Claim
21 words
A transparent article according to claim 12, wherein said conductive metal is selected from the group consisting of nickel and copper.
Claim 16
Dependent Claim
13 words
A transparent article according to claim 13, wherein said conductive metal is copper.
Claim 17
Dependent Claim
23 words
A transparent article according to claim 11, wherein said transparent substrate is selected from the group consisting of glass and rigid transparent plastics.
Claim 18
Dependent Claim
33 words
A transparent article according to claim 15, wherein said transparent substrate comprises a laminate comprising at least one layer of a rigid transparent plastic selected from the group consisting of polycarbonate and acrylic.
Claim 19
Dependent Claim
18 words
A transparent article according to claim 16, wherein said transparent substrate comprises a layer of transparent thermoplastic plastic.
Claim 20
Dependent Claim
22 words
A transparent article according to claim 17, wherein said thermoplastic layer is selected from the group consisting of polyvinyl butyral and polyurethanes.
Claim 21
Dependent Claim
13 words
A transparent article according to claim 15, wherein said transparent plastic is acrylic.
Claim 22
Dependent Claim
13 words
A transparent article according to claim 15, wherein said transparent plastic is polycarbonate.
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) | 1991-09-20 | 1992-03-21 | 1992-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-09-20 | 1996-03-21 | 1996-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-09-20 | 2000-03-21 | 2000-09-20 | $7700.00 | Window Closed / Lapsed |