Patent US4770921A successfully refreshed from Google Patents.
US4770921A
Expired / Lapsed
US
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Self-shielding multi-layer circuit boards
Assignee: JPMorgan Chase Bank NA
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Filing: 1986-09-11
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Granted: 1988-09-13
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Expires: 2006-09-11
Abstract
Abstract Self-shielding multi-layer circuit boards are produced utilizing augmentative replacement techniques.
Inventors
- 👤 Thomas P. Wacker
- 👤 Charles W. Eichelberger
- 👤 Robert J. Wojnarowski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 21:36
CPC Classifications
H; H05; H05K; H05K9/00; H05K9/0007; H05K9/002; H05K9/0039; H05K1/00; H05K1/02; H05K1/0213; H05K1/0216; H05K1/0218; H05K2201/00; H05K2201/07; H05K2201/0707; H05K2201/0715; H05K2203/00; H05K2203/07; H05K2203/0703; H05K2203/073; H05K3/00; H05K3/46; H05K3/4644; Y; Y10; Y10S; Y10S428/00; Y10S428/901; Y10T; Y10T428/00; Y10T428/12; Y10T428/12014; Y10T428/12028; Y10T428/12035; Y10T428/12049; Y10T428/24; Y10T428/24802; Y10T428/24917; Y10T428/31504; Y10T428/31652; Y10T428/31663
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
110 words
A multi-layer circuit board comprising (a) a two-sided base; (b) at least one combination of circuit conductive pattern with insulating dielectric layer adhered thereover designed on at least one side of said base; and (c) uniform voltage conductive patterns designed as an outermost conductive pattern on both sides of said two-sided base, wherein said uniform voltage conductive patterns cover a sufficient surface area of all underlying circuit conductive patterns to reduce the power of noise emission from said underlying circuit conductive patterns by 1/2 in either direction from the surface of said two-sided base and at least one of said uniform voltage conductive patterns is designed by augmentative replacement techniques.
Claim 2
Dependent Claim
110 words
A multi-layer circuit board comprising (a) a two-sided base; (b) at least one combination of circuit conductive pattern with insulating dielectric layer adhered thereover designed on at least one side of said base; and (c) uniform voltage conductive patterns designed as an outermost conductive pattern on both sides of said two-sided base, wherein said uniform voltage conductive patterns cover a sufficient surface area of all underlying circuit conductive patterns to reduce the power of noise emission from said underlying circuit conductive patterns by 1/2 in either direction from the surface of said two-sided base and at least one of said uniform voltage conductive patterns is designed by augmentative replacement techniques.
Claim 3
Dependent Claim
20 words
The circuit board of claim 1 wherein at least one said circuit conductive pattern is designed by resist imaging techniques.
Claim 4
Dependent Claim
19 words
The circuit board of claim 1 wherein at least one said circuit conductive pattern is designed by augmentative replacement.
Claim 5
Dependent Claim
25 words
The circuit board of claim 1 wherein said circuit conductive pattern and said dielectric layer thereover are applied to both sides of said two-sided base.
Claim 6
Dependent Claim
19 words
The circuit board of claim 1 wherein the thickness of said two-sided base is less than about 1/4 inch.
Claim 7
Dependent Claim
21 words
The circuit board of claim 1 wherein said dielectric layers have a thickness ranging from about 1 to about 4 mils.
Claim 8
Dependent Claim
35 words
The circuit board of claim 1 wherein said uniform voltage conductive patterns cover at least about 50% of the surface area of all said underlying circuit conductive patterns from either side of said two-sided base.
Claim 9
Dependent Claim
28 words
The circuit board of claim 1 wherein said uniform conductive pattern is closer to the conductors of said circuit conductive pattern than said conductors are to one another.
Claim 10
Dependent Claim
12 words
The circuit board of claim 1 wherein said dielectric layer is photo-imaged.
Claim 11
Dependent Claim
13 words
The circuit board of claim 1 wherein said dielectric layer is screen printed.
Claim 12
Dependent Claim
82 words
A multi-layer circuit board comprising: (a) a two-sided base; (b) a combination of circuit conductive pattern with insulating dielectric layer adhered thereover designed on both sides of said base; and (c) uniform voltage conductive patterns designed as an outermost conductive pattern on both sides of said base, wherein said uniform voltage conductive patterns cover at least about 50% of the surface area of all underlying circuit conductive patterns and both of said uniform voltage conductive patterns are designed by augmentative replacement techniques.
Claim 13
Dependent Claim
82 words
A multi-layer circuit board comprising: (a) a two-sided base; (b) a combination of circuit conductive pattern with insulating dielectric layer adhered thereover designed on both sides of said base; and (c) uniform voltage conductive patterns designed as an outermost conductive pattern on both sides of said base, wherein said uniform voltage conductive patterns cover at least about 50% of the surface area of all underlying circuit conductive patterns and both of said uniform voltage conductive patterns are designed by augmentative replacement techniques.
Claim 14
Dependent Claim
69 words
A multi-layer circuit board comprising: (a) a uniform voltage conductive pattern designed by augmentative replacement on a dielectric layer covering a circuit conductive pattern as an outermost conductive pattern, wherein said uniform voltage conductive pattern covers a sufficient area of underlying circuit conductive patters to reduce the power of noise emission from said underlying circuit conductive patterns by 1/2 in either direction from the surface of said two-sided base.
Claim 15
Dependent Claim
69 words
A multi-layer circuit board comprising: (a) a uniform voltage conductive pattern designed by augmentative replacement on a dielectric layer covering a circuit conductive pattern as an outermost conductive pattern, wherein said uniform voltage conductive pattern covers a sufficient area of underlying circuit conductive patters to reduce the power of noise emission from said underlying circuit conductive patterns by 1/2 in either direction from the surface of said two-sided base.
References Cited (Backward Citations)
US4404237A
Cited
US4416914A
Cited
US4487811A
Cited
US4522888A
Cited
US4495251A
Cited
US4438291A
Cited
US4528748A
Cited
US4470883A
Cited
US4591220A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-09-13 | 1992-03-14 | 1992-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-09-13 | 1996-03-14 | 1996-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-09-13 | 2000-03-14 | 2000-09-13 | $7700.00 | Window Closed / Lapsed |