Nonorthogonal EMP shielding elements

• US 4,772,760 A
• Filed: 04/28/1987
• Issued: 09/20/1988
• Est. Priority Date: 04/28/1987
• Status: Expired due to Fees

• Current Assignee: PPG Industries Incorporated (Nouryon BV)
• Original Assignee: PPG Industries Incorporated (Nouryon BV)
• Inventors: Graham, Charles R.
• Primary Examiner(s): Grimley, Arthur T.
• Assistant Examiner(s): TONE, DAVID
• Application Number:
  US07/043,919
• Time in Patent Office: 511 Days
• Field of Search: 174/35 R, 174/35 MS, 219/10.55 D, 361/424, 358/245, 455/300, 455/301
• US Class Current: 174/389
• CPC Class Codes: B64C 1/1476 Canopies; Windscreens or similar transparent elements
• CPC Class Codes: G01R 1/18 Screening arrangements against electric or magnetic fields, e.g. against earth's field
• CPC Class Codes: H05K 9/0094 being light-transmitting, e.g. transparent, translucent

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.

Claims

1. 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.

2. A transparent article according to claim 1, wherein said nonorthogonal grid pattern is a conductive metal.

3. A transparent article according to claim 2, wherein said conductive metal is selected from the group consisting of nickel and copper.

4. A transparent article according to claim 3, wherein said conductive metal is copper.

5. A transparent article according to claim 1, wherein said transparent substrate is selected from the group consisting of glass and rigid transparent plastics.

6. 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.

7. A transparent article according to claim 6, wherein said transparent substrate comprises a layer of transparent thermoplastic plastic.

8. A transparent article according to claim 7, wherein said thermoplastic layer is selected from the group consisting of polyvinyl butyral and polyurethanes.

9. A transparent article according to claim 5, wherein said transparent plastic is acrylic.

10. A transparent article according to claim 5, wherein said transparent plastic is polycarbonate.

11. 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.

12. A transparent article according to claim 11, wherein said nonorthogonal grid pattern is a conductive metal.

13. A transparent article according to claim 12, wherein said conductive metal is selected from the group consisting of nickel and copper.

14. A transparent article according to claim 13, wherein said conductive metal is copper.

15. A transparent article according to claim 11, wherein said transparent substrate is selected from the group consisting of glass and rigid transparent plastics.

16. 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.

17. A transparent article according to claim 16, wherein said transparent substrate comprises a layer of transparent thermoplastic plastic.

18. A transparent article according to claim 17, wherein said thermoplastic layer is selected from the group consisting of polyvinyl butyral and polyurethanes.

19. A transparent article according to claim 15, wherein said transparent plastic is acrylic.

20. A transparent article according to claim 15, wherein said transparent plastic is polycarbonate.