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US4891468A
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US
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Device to shield against an electromagnetic field
Assignee: Individual
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Filing: 1988-10-26
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Granted: 1990-01-02
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Expires: 2008-10-26
Abstract
Abstract Device to shield against an electromagnetic field, consisting of a shielding film made of metal, in particular aluminum or metallized plastic which is provided with openings, the shielding film having an essentially hexagonal outline and being subdivided into six triangular fields by ridges connecting the corners to the center of the film and the openings consisting of slits which are parallel to the hexagon side of each triangular field and to each other and extend over the entire triangular field (FIG. 1).
Inventors
- 👤 Franz Andrae
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 22:35
CPC Classifications
A; A47; A47C; A47C31/00; A47C31/004; A61; A61N; A61N1/00; A61N1/16; H; H05; H05K; H05K9/00; H05K9/0073; H05K9/0081; H05K9/0086
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
83 words
Device to shield against an electromagnetic field, comprising a shielding film made of metal, said shielding film being provided with openings, said shielding film having an essentially hexagonal outline with sides, corners, and a center, said shielding film being subdivided into six triangular fields by ridges connecting the corners to the center of said shielding film, said openings comprising slits which are parallel to the hexagonal side of each triangular field and to each other, said slits extending over the entire triangular field.
Claim 2
Dependent Claim
83 words
Device to shield against an electromagnetic field, comprising a shielding film made of metal, said shielding film being provided with openings, said shielding film having an essentially hexagonal outline with sides, corners, and a center, said shielding film being subdivided into six triangular fields by ridges connecting the corners to the center of said shielding film, said openings comprising slits which are parallel to the hexagonal side of each triangular field and to each other, said slits extending over the entire triangular field.
Claim 3
Dependent Claim
13 words
The device of claim 1 wherein said shielding film is made of aluminum.
Claim 4
Dependent Claim
14 words
The device of claim 1 wherein said shielding film is made of metalized plastic.
Claim 5
Dependent Claim
26 words
The device of claim 1 further comprising two essentially hexagonal plates which are adhered to each other, said shielding film being disposed between said hexagonal plates.
Claim 6
Dependent Claim
13 words
The device of claim 4 wherein said hexagonal plates are made of plywood.
Claim 7
Dependent Claim
19 words
The device of claim 4 wherein one of said plates includes a circular recess for receiving said shielding film.
References Cited (Backward Citations)
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Cited
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Cited
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-01-01 | 1993-07-03 | 1994-01-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-01-01 | 1997-07-03 | 1998-01-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-01-01 | 2001-07-03 | 2002-01-02 | $7700.00 | Window Closed / Lapsed |