US6815085B2
Expired / Lapsed
US
⏱️ 0.0 years remaining
Printed circuit board capacitor structure and method
Assignee: International Business Machines Corp
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Filing: 2003-05-12
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Granted: 2004-11-09
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Expires: 2023-05-12
Abstract
Abstract A capacitive element for a circuit board or chip carrier is formed from a pair of conductive sheets having a dielectric component laminated therebetween. The dielectric component is formed of two or more dielectric sheets, at least one of which can be partially cured followed by being fully cured. The partially cured sheet is laminated to at least one other sheet of dielectric material and one of the sheets of conductive material. The total thickness of the two sheets of the dielectric component does not exceed about 4 mils and preferably does not exceed about 3 mils. The use of two or more sheets of dielectric material makes it very unlikely that two or more defects in the sheets of dielectric material will align, thus greatly reducing the probability of a defect causing a failure in test or field use.
Inventors
- 👤 Bernd K. Appelt
- 👤 John M. Lauffer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 12:00
CPC Classifications
H; H05; H05K; H05K1/00; H05K1/16; H05K1/162; H05K1/02; H05K1/03; H05K1/0313; H05K1/0353; H05K1/0366; H05K2201/00; H05K2201/01; H05K2201/0183; H05K2201/0195; H05K2201/02; H05K2201/0203; H05K2201/0206; H05K2201/0209; H05K2201/03; H05K2201/0332; H05K2201/0335; H05K2201/0355; H05K2201/09; H05K2201/09209; H05K2201/0929; H05K2201/09309; H05K3/00; H05K3/40; H05K3/42; H05K3/429; H05K3/46; H05K3/4611; H05K3/4641; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12535; Y10T428/12556; Y10T428/12569; Y10T428/12597; Y10T428/12771; Y10T428/12861; Y10T428/12903; Y10T428/24; Y10T428/24058; Y10T428/24124; Y10T428/24752; Y10T428/2476; Y10T428/249921; Y10T428/249924; Y10T428/24994; Y10T428/24995; Y10T428/249952; Y10T428/25; Y10T428/252; Y10T428/26; Y10T428/263; Y10T428/264; Y10T428/265; Y10T428/269
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
105 words
A capacitive element, comprising: two sheets of thermoplastic or thermosetting resinous dielectric material, each sheet having a thickness of less than about 1 mil and each sheet comprising a sheet of glass cloth impregnated with a resin, said sheets of dielectric material being formed from different dielectric materials and being bonded together to form a dielectric component being free of pin hole defects, said dielectric component having a total thickness of less than about 2 mils; and first and second sheets of conductive material; wherein said dielectric component is laminated between said first and second sheets of conductive material and is fully cured or hardened.
Claim 2
Dependent Claim
105 words
A capacitive element, comprising: two sheets of thermoplastic or thermosetting resinous dielectric material, each sheet having a thickness of less than about 1 mil and each sheet comprising a sheet of glass cloth impregnated with a resin, said sheets of dielectric material being formed from different dielectric materials and being bonded together to form a dielectric component being free of pin hole defects, said dielectric component having a total thickness of less than about 2 mils; and first and second sheets of conductive material; wherein said dielectric component is laminated between said first and second sheets of conductive material and is fully cured or hardened.
Claim 3
Dependent Claim
27 words
The capacitive element according to claim 1 wherein at least one of the sheets of glass cloth is impregnated with an epoxy resin which is fully cured.
Claim 4
Dependent Claim
43 words
The capacitive element according to claim 1 wherein at least one of the dielectric sheets is filled with particles having a high dielectric constant, the particles having a size distribution between about 0.1 microns and about one-half of the thickness of the sheet.
Claim 5
Dependent Claim
28 words
The capacitive element according to claim 3 wherein the particles are selected from the group consisting of barium titanate, strontium titanate, lead-zinc titanate, tantalum oxide and mixtures thereof.
Claim 6
Dependent Claim
23 words
The capacitive element according to claim 1 wherein the capacitance of the element is at least about 500 pico farads per square inch.
Claim 7
Dependent Claim
101 words
A capacitive element, comprising: three sheets of thermoplastic or thermosetting resinous dielectric material, each of the sheets having a thickness of less than about 1 mil and comprising a sheet of glass cloth, and each of said sheets of dielectric material impregnated with a resin, said sheets being bonded together to form a dielectric component being free of pin bole defects, and having a total thickness of less than about 3 mils; and first and second sheets of conductive material; wherein said dielectric component is laminated between said first and second sheets of conductive material and is fully cured or hardened.
Claim 8
Dependent Claim
101 words
A capacitive element, comprising: three sheets of thermoplastic or thermosetting resinous dielectric material, each of the sheets having a thickness of less than about 1 mil and comprising a sheet of glass cloth, and each of said sheets of dielectric material impregnated with a resin, said sheets being bonded together to form a dielectric component being free of pin bole defects, and having a total thickness of less than about 3 mils; and first and second sheets of conductive material; wherein said dielectric component is laminated between said first and second sheets of conductive material and is fully cured or hardened.
Claim 9
Dependent Claim
24 words
The capacitive element according to claim 6 wherein at least one of the three sheets of glass cloth is impregnated with an epoxy resin.
Claim 10
Dependent Claim
43 words
The capacitive element according to claim 6 wherein at least one of the dielectric sheets is filled with particles having a high dielectric constant, the particles having a size distribution between about 0.1 microns and about one-half of the thickness of the sheet.
Claim 11
Dependent Claim
27 words
The capacitive element according to claim 8 wherein the particles are selected from the group comprising barium titanate, strontium titanate, lead-zinc titanate, tantalum oxide and mixtures thereof.
Claim 12
Dependent Claim
20 words
The capacitive element according to claim 6 wherein the capacitance is at least about 500 pico farads per square inch.
Claim 13
Dependent Claim
24 words
The capacitive element according to claim 6 wherein at least two of the sheets of dielectric material are formed from different resinous dielectric materials.
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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) | 2007-11-09 | 2008-05-10 | 2008-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2011-11-09 | 2012-05-10 | 2012-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2015-11-09 | 2016-05-10 | 2016-11-09 | $7700.00 | Window Closed / Lapsed |