Patent US4803308A successfully refreshed from Google Patents.
US4803308A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Printed circuit board
Assignee: Sharp Corp
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Filing: 1988-05-27
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Granted: 1989-02-07
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Expires: 2008-05-27
Abstract
Abstract A printed circuit board has a copper foil pattern formed thereon in the shape of exclamation marks oriented in the direction of solder flow such that undesirable peelback effects can be isolated and the amount of solder attached to the pattern can be uniformly controlled.
Inventors
- 👤 Toshimichi Taguchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 15:05
CPC Classifications
H; H05; H05K; H05K3/00; H05K3/30; H05K3/32; H05K3/34; H05K3/3452; H05K1/00; H05K1/02; H05K1/11; H05K1/111; H05K3/3465; H05K3/3468; H05K2201/00; H05K2201/09; H05K2201/09209; H05K2201/09654; H05K2201/09781; H05K2201/09818; H05K2201/099; H05K2201/10; H05K2201/10613; H05K2201/10621; H05K2201/10689; H05K2203/00; H05K2203/04; H05K2203/044; H05K2203/046; H05K3/341; H05K3/3415; H05K3/3447; Y; Y02; Y02P; Y02P70/00; Y02P70/50
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
86 words
In a printed circuit board including a substrate having a surface and copper foil pieces attached on said surface with some areas of said pieces being covered and other areas exposed, said exposed areas of said copper foil pieces describing a pattern, the improvement wherein said pattern includes a first part and a second part, said first part being elongated along and defining a line and said second part being separated from said first part being shorter than said first part and located on said line.
Claim 2
Dependent Claim
86 words
In a printed circuit board including a substrate having a surface and copper foil pieces attached on said surface with some areas of said pieces being covered and other areas exposed, said exposed areas of said copper foil pieces describing a pattern, the improvement wherein said pattern includes a first part and a second part, said first part being elongated along and defining a line and said second part being separated from said first part being shorter than said first part and located on said line.
Claim 3
Dependent Claim
14 words
The printed circuit board of claim 1 wherein said separated second part is circular.
Claim 4
Dependent Claim
19 words
The printed circuit board of claim 1 wherein said elongated first part is thinner towards said separated second part.
Claim 5
Dependent Claim
34 words
The printed circuit board of claim 1 wherein said elongated first part includes one or more solder resist patches on said copper foil pieces to control the amount of solder attached to said pattern.
Claim 6
Dependent Claim
47 words
The printed circuit board of claim 1 further comprising a solder resist layer which is coveringly attached to said copper foil pieces and said surface of said substrate, said resist layer being provided with openings according to said pattern to expose portions of said copper foil pieces.
Claim 7
Dependent Claim
22 words
The printed circuit board of claim 1 wherein said line is substantially parallel to a solder flow direction defined on said surface.
Claim 8
Dependent Claim
25 words
The printed circuit board of claim 6 wherein said second part is near said first part and located downstream therefrom along said solder flow direction.
Claim 9
Dependent Claim
65 words
In a printed circuit board including a substrate having a surface and copper foil pieces attached on said surface, the improvement wherein said copper foil pieces form a pattern on said surface and wherein said pattern includes an elongated first part along and defining a line and a shorter second part near and separated from said elongated first part and located on said defined line.
Claim 10
Dependent Claim
65 words
In a printed circuit board including a substrate having a surface and copper foil pieces attached on said surface, the improvement wherein said copper foil pieces form a pattern on said surface and wherein said pattern includes an elongated first part along and defining a line and a shorter second part near and separated from said elongated first part and located on said defined line.
Claim 11
Dependent Claim
22 words
The printed circuit board of claim 8 wherein said line is substantially parallel to a solder flow direction defined on said surface.
Claim 12
Dependent Claim
23 words
The printed circuit board of claim 9 wherein said second part is located downstream from said first part along said solder flow direction.
Claim 13
Dependent Claim
14 words
The printed circuit board of claim 8 wherein said separated second part is circular.
Claim 14
Dependent Claim
19 words
The printed circuit board of claim 8 wherein said elongated first part is thinner towards said separated second part.
Claim 15
Dependent Claim
33 words
The printed circuit board of claim 8 wherein said elongated first part includes one or more solder resist patches on said copper foil to control the amount of solder attached to said pattern.
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) | 1992-02-07 | 1992-08-08 | 1993-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-02-07 | 1996-08-08 | 1997-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-02-07 | 2000-08-08 | 2001-02-07 | $7700.00 | Window Closed / Lapsed |