US4754101A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electromagnetic shield for printed circuit board
Assignee: Laird Technologies Inc
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Filing: 1986-10-23
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Granted: 1988-06-28
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Expires: 2006-10-23
Abstract
Abstract An electromagnetic shield includes electrically conductive walls arranged to form a closed boundry. The walls include pins projecting from a lower edge to secure the shield on a printed circuit board and to provide a connection to a conducting layer in the printed circuit board and engagement prongs on the upper edge to engage a cover plate.
Inventors
- 👤 William H Stickney
- 👤 Ronald W. Brewer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:55
CPC Classifications
H; H05; H05K; H05K9/00; H05K9/0007; H05K9/002; H05K9/0022; H05K9/0024; H05K9/0032; Y; Y10; Y10S; Y10S174/00; Y10S174/35
Claims Analysis
Total Claims: 35
Claim 1
Independent Claim
77 words
An electromagnetic shield, comprising: electrically conductive walls arranged to form a closed frame; means projecting from a lower edge of the walls for engaging with a printed circuit board; deflectable engagement prongs extending from an upper edge of the walls; and an electrically conductive cover having dimensions similar to those of the closed frame engaged within said engagement prongs; wherein the walls and engagement prongs are outwardly deflectable to allow for insertion and removal of the cover.
Claim 2
Dependent Claim
77 words
An electromagnetic shield, comprising: electrically conductive walls arranged to form a closed frame; means projecting from a lower edge of the walls for engaging with a printed circuit board; deflectable engagement prongs extending from an upper edge of the walls; and an electrically conductive cover having dimensions similar to those of the closed frame engaged within said engagement prongs; wherein the walls and engagement prongs are outwardly deflectable to allow for insertion and removal of the cover.
Claim 3
Dependent Claim
16 words
The electromagnetic shield of claim 1, wherein the engagement prongs have greater deflectability than the walls.
Claim 4
Dependent Claim
34 words
The electromagnetic shield of claim 2, wherein the engagement prongs are adapted to incur at least 75% of the deflection necessary for the insertion and removal of the cover occurs in the engagement prongs.
Claim 5
Dependent Claim
13 words
The electromagnetic shield of claim 1, wherein the walls have ventilation openings therein.
Claim 6
Dependent Claim
14 words
The electromagnetic shield of claim 1, wherein the engaging means comprise regularly spaced pins.
Claim 7
Dependent Claim
14 words
The electromagnetic shield of claim 5, wherein the pins have a U-shaped cross section.
Claim 8
Dependent Claim
43 words
The electromagnetic shield of claim 1, wherein each of the walls comprises an upper half which includes the upper edge and a lower half which includes the lower edge, said upper half having a thickness less than the thickness of the lower half.
Claim 9
Dependent Claim
22 words
The electromagnetic shield of claim 7, wherein the thickness of the lower half is six times the thickness of the upper half.
Claim 10
Dependent Claim
23 words
The electromagnetic shield of claim 7, wherein the upper half and the lower half are manufactured from different compositions and are welded together.
Claim 11
Dependent Claim
21 words
The electromagnetic shield of claim 9, wherein the upper half is of beryllium copper and the lower half is of brass.
Claim 12
Dependent Claim
25 words
The electromagnetic shield of claim 1, wherein the engagement prongs are defined by parallel slots extending in the walls perpendicular to a center line thereof.
Claim 13
Dependent Claim
20 words
The electromagnetic shield of claim 1, wherein the walls are made of high permeability material plated with a conductive material.
Claim 14
Dependent Claim
25 words
The electromagnetic shield of claim 1, wherein the printed circuit board engaging means include means for grounding the electromagnetic shield to the printed circuit board.
Claim 15
Dependent Claim
90 words
A component of an electromagnetic shield, comprising: a strip of electrically conductive metal; means projecting from a first edge of the strip for engaging with a printed circuit board, said means projecting substantially perpendicularly to a center line of the strip; and a plurality of engagement prongs defined by a plurality of slots extending through a second edge of the strip in a direction substantially perpendicular to the center line of the strip; wherein the engagement prongs each have an outward curve forming a recess for engaging a cover plate.
Claim 16
Dependent Claim
90 words
A component of an electromagnetic shield, comprising: a strip of electrically conductive metal; means projecting from a first edge of the strip for engaging with a printed circuit board, said means projecting substantially perpendicularly to a center line of the strip; and a plurality of engagement prongs defined by a plurality of slots extending through a second edge of the strip in a direction substantially perpendicular to the center line of the strip; wherein the engagement prongs each have an outward curve forming a recess for engaging a cover plate.
Claim 17
Dependent Claim
13 words
The component of claim 14, wherein said engaging means are regularly spaced pins.
Claim 18
Dependent Claim
19 words
The component of claim 15, wherein the pins are adapted to fit in holes of a printed circuit board.
Claim 19
Dependent Claim
13 words
The component of claim 15, wherein the pins have a U-shaped cross section.
Claim 20
Dependent Claim
24 words
The component of claim 14, further comprising mens extending from one end of the strip for fastening to the other end of the strip.
Claim 21
Dependent Claim
15 words
The component of claim 14, wherein the engagement prongs have greater deflectability than the strip.
Claim 22
Dependent Claim
18 words
The component of claim 14, wherein the metal is a high permeability material plated with a conductive material.
Claim 23
Dependent Claim
109 words
A component of an electromagnetic shield, comprising: a strip of electrically conductive metal; means projecting from a first edge of the strip for engaging wiht a printed circuit board, said means projecting substantially perpendicularly to a center line of the strip; and a plurality of engagement prongs defined by a plurality of slots extending through a second edge of the strip in a direction substantially perpendicular to the center line of the strip; wherein the metal strip comprises a lower half which includes the first edge and an upper half which includes the second edge, said upper half having a thickness less than the thickness of the lower half.
Claim 24
Dependent Claim
109 words
A component of an electromagnetic shield, comprising: a strip of electrically conductive metal; means projecting from a first edge of the strip for engaging wiht a printed circuit board, said means projecting substantially perpendicularly to a center line of the strip; and a plurality of engagement prongs defined by a plurality of slots extending through a second edge of the strip in a direction substantially perpendicular to the center line of the strip; wherein the metal strip comprises a lower half which includes the first edge and an upper half which includes the second edge, said upper half having a thickness less than the thickness of the lower half.
Claim 25
Dependent Claim
21 words
The component of claim 21, wherein the thickness of the lower half is six times the thickness of the upper half.
Claim 26
Dependent Claim
22 words
The component of claim 21, wherein the upper half and the lower half are manufactured from different compositions and are welded together.
Claim 27
Dependent Claim
20 words
The component of claim 23, wherein the upper half is of beryllium copper and the lower half is of brass.
Claim 28
Independent Claim
66 words
A method of assembling an electromagnetic shield, comprising the steps of: providing a strip of electrically conductive metal having pins extending from one edge thereof and engagement prongs extending form an opposite edge thereof; cutting the strip into a preferred length; forming the strip into a closed frame; inserting the pins into holes in a printed circuit board; and engaging a cover within the engagement prongs.
Claim 29
Independent Claim
66 words
A method of assembling an electromagnetic shield, comprising the steps of: providing a strip of electrically conductive metal having pins extending from one edge thereof and engagement prongs extending form an opposite edge thereof; cutting the strip into a preferred length; forming the strip into a closed frame; inserting the pins into holes in a printed circuit board; and engaging a cover within the engagement prongs.
Claim 30
Dependent Claim
17 words
The method of claim 25, further comprising the step of fastening together the ends of the strip.
Claim 31
Dependent Claim
17 words
The method of claim 25, further comprising the step of grounding at least one of the pins.
Claim 32
Dependent Claim
95 words
A component of an electromagnetic shield comprising: a strip of electrically conductive metal; means projecting from a first edge of the strip for engaging with a printed circuit board, said means projecting substantially perpendicularly to a center line of the strip; a plurality of engagement prongs defined by a plurality of slots extending through a second edge of the strip in a direction substantially perpendicular to the center line of the strip, wherein the engagement prongs have greater deflectability than the strip; and reinforcing means in the strip for reducing the deflectability of the strip.
Claim 33
Dependent Claim
95 words
A component of an electromagnetic shield comprising: a strip of electrically conductive metal; means projecting from a first edge of the strip for engaging with a printed circuit board, said means projecting substantially perpendicularly to a center line of the strip; a plurality of engagement prongs defined by a plurality of slots extending through a second edge of the strip in a direction substantially perpendicular to the center line of the strip, wherein the engagement prongs have greater deflectability than the strip; and reinforcing means in the strip for reducing the deflectability of the strip.
Claim 34
Dependent Claim
103 words
A component of an electromagnetic shield, comprising: a strip of electrically conductive metal; means projecting from a first edge of the strip for engaging with a printed circuit board, said means projecting substantially perpendicularly to a center line of the strip; a plurality of engagement prongs defined by a plurality of slots extending through a second edge of the strip in a direction substantially perpendicular to the center line of the strip; and aperture means provided at the end of said slots for increasing the deflectability of the engagement prongs, said aperture means having a width greater than the width of said slots.
Claim 35
Dependent Claim
103 words
A component of an electromagnetic shield, comprising: a strip of electrically conductive metal; means projecting from a first edge of the strip for engaging with a printed circuit board, said means projecting substantially perpendicularly to a center line of the strip; a plurality of engagement prongs defined by a plurality of slots extending through a second edge of the strip in a direction substantially perpendicular to the center line of the strip; and aperture means provided at the end of said slots for increasing the deflectability of the engagement prongs, said aperture means having a width greater than the width of said slots.
References Cited (Backward Citations)
US2257536A
Cited
US2125856A
Cited
US3721746A
Cited
US4404617A
Cited
US4330163A
Cited
US4370515A
Cited
US4390220A
Cited
US4556757A
Cited
US4433886A
Cited
US4437718A
Cited
US4514029A
Cited
US4512618A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-06-28 | 1991-12-28 | 1992-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-06-28 | 1995-12-28 | 1996-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-06-28 | 1999-12-28 | 2000-06-28 | $7700.00 | Window Closed / Lapsed |