US4434541A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electromagnetic shielding
Assignee: Parker Hannifin Customer Support Inc
•
Filing: 1980-12-22
•
Granted: 1984-03-06
•
Expires: 2000-12-22
Abstract
Abstract Electromagnetic energy shielding material in forms such as form stable gaskets, caulking compounds, coatings, adhesives, etc., the material being composed of a plastic binder and electrically conductive particles having an aluminum core, a first metallic layer thereover e.g., of tin and a silver outer layer.
Inventors
- 👤 Donald H. Powers, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 07:55
CPC Classifications
H; H05; H05K; H05K9/00; H05K9/0007; H05K9/0015; C; C08; C08K; C08K3/00; C08K3/02; C08K3/08; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49016; Y10T428/00; Y10T428/12; Y10T428/12181
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
108 words
The method of providing electromagnetic shielding between two surfaces which comprises placing an electromagnetic energy shield between said two surfaces, said electromagnetic energy shield having a volume resistivity to be effective as an electromagnetic energy shield, said shield having dispersed therein electrically conductive irregularly shaped particles, said particles comprising an outer surface of silver on a sensitizing layer of tin which is on an aluminum central core, said tin being present on said aluminum in an amount sufficient to provide a surface to which the silver may be placed thereon, said particles having the ability to withstand 120° C. for 120 hours without exhibiting substantial loss in conductivity.
Claim 2
Independent Claim
108 words
The method of providing electromagnetic shielding between two surfaces which comprises placing an electromagnetic energy shield between said two surfaces, said electromagnetic energy shield having a volume resistivity to be effective as an electromagnetic energy shield, said shield having dispersed therein electrically conductive irregularly shaped particles, said particles comprising an outer surface of silver on a sensitizing layer of tin which is on an aluminum central core, said tin being present on said aluminum in an amount sufficient to provide a surface to which the silver may be placed thereon, said particles having the ability to withstand 120° C. for 120 hours without exhibiting substantial loss in conductivity.
Claim 3
Dependent Claim
16 words
The method of claim 1 in which the silver is plated on the sensitizing tin layer.
Claim 4
Dependent Claim
11 words
The method of claim 2 in which the resin is silicone.
Claim 5
Independent Claim
81 words
A method of providing electromagnetic energy shielding between two surfaces which comprises placing a form stable gasket between said two surfaces and clamping said surfaces together to compress the gasket therebetween, said gasket comprising having a volume resistivity to be effective as an electromagnetic energy shield, said material comprising a resin matrix loaded with electrically conductive, irregularly shaped particles, said particles comprising an aluminum core having a first layer of tin and a second layer of silver on said first layer.
Claim 6
Independent Claim
81 words
A method of providing electromagnetic energy shielding between two surfaces which comprises placing a form stable gasket between said two surfaces and clamping said surfaces together to compress the gasket therebetween, said gasket comprising having a volume resistivity to be effective as an electromagnetic energy shield, said material comprising a resin matrix loaded with electrically conductive, irregularly shaped particles, said particles comprising an aluminum core having a first layer of tin and a second layer of silver on said first layer.
Claim 7
Dependent Claim
32 words
The method of claim 4 in which said first layer comprises 1 to 10% by weight of said particles and said second layer comprises 10 to 25% by weight of said particles.
Claim 8
Dependent Claim
18 words
The method of claim 4 in which said particles comprises 20 to 50% volume percent of the material.
Claim 9
Dependent Claim
12 words
The method of claim 4 in which the resin matrix is silicone.
Claim 10
Independent Claim
64 words
The method of providing electromagnetic energy shielding between two surfaces which comprises placing between said two surfaces a material having a volume resistivity to be effective as an electromagnetic energy shield comprising a resin matrix loaded with irregularly shaped particles, said particles comprising an aluminum core, a first layer of zinc on said aluminum and a second layer of silver on said first layer.
Claim 11
Independent Claim
64 words
The method of providing electromagnetic energy shielding between two surfaces which comprises placing between said two surfaces a material having a volume resistivity to be effective as an electromagnetic energy shield comprising a resin matrix loaded with irregularly shaped particles, said particles comprising an aluminum core, a first layer of zinc on said aluminum and a second layer of silver on said first layer.
Claim 12
Dependent Claim
32 words
The material of claim 8 in which the first layer comprises 1 to 10% by weight of the particles and the second layer comprises 10 to 25% by weight of the particles.
Claim 13
Dependent Claim
26 words
The material of claim 8 in which the average particle size is 1 to 60 microns and the volume resistivity is less than 0.01 ohm cm.
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) | 1987-03-06 | 1987-09-05 | 1988-03-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-03-06 | 1991-09-05 | 1992-03-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-03-06 | 1995-09-05 | 1996-03-06 | $7700.00 | Window Closed / Lapsed |