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US4814940A Expired / Lapsed US ⏱️ 0.0 years remaining

Low inductance capacitor

Assignee: International Business Machines Corp
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Filing: 1987-05-28
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Granted: 1989-03-21
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Expires: 2007-05-28
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Abstract

Abstract A capacitor with a low parasitic inductance, which is particularly suited for use as a decoupling capacitor, that has a prismatic or polyhedral shape and includes a plurality of internal capacitor plates positioned and separated by dielectric material. The improvement is that each plate is provided with a tab that projects diagonally to a corner of the body with the edge of the tab exposed. A metal layer on the outside of the body electrically connects the plates in the desired sequence.

Inventors

  • 👤 Richard E. Horstmann
  • 👤 James M. Oberschmidt

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-03 12:32
CPC Classifications
H; H01; H01G; H01G4/00; H01G4/30; H01G4/002; H01G4/005; H01G4/012; H01G4/228; H01G4/232

Claims Analysis

Total Claims: 14
Claim 1
Independent Claim 209 words
A low inductance capacitor having a body with a prismatic or polyhedral shape, and including a plurality of internal capacitor plates positioned and maintained in spaced relation with dielectric material, each plate provided with a tab having an end exposed on at least one side of said body, the improvement comprising, each of said plates having said tab projecting diagonally to a corner of said body and having an edge exposed, said plates arranged within said body with said tabs of each successive plate projecting to different corners of said body, a first metallized area in contact with said tabs projecting toward at least one of two of the corners of said body a second metallized area in contact with said tabs projecting toward the remaining corners of said body, said first metallized area and said second metallized area establishing electrical contact with different sets of said plates, and constituting terminals to said capacitor wherein an edge dimension of each of said tabs is large compared to the spacing between adjacent tabs of two succeeding plates along a side of said body so as to keep the angle between the incoming and outgoing current close to 180°, thereby minimizing the mutual inductance, and wherein said capacitor has low inductance.
Claim 2
Dependent Claim 209 words
A low inductance capacitor having a body with a prismatic or polyhedral shape, and including a plurality of internal capacitor plates positioned and maintained in spaced relation with dielectric material, each plate provided with a tab having an end exposed on at least one side of said body, the improvement comprising, each of said plates having said tab projecting diagonally to a corner of said body and having an edge exposed, said plates arranged within said body with said tabs of each successive plate projecting to different corners of said body, a first metallized area in contact with said tabs projecting toward at least one of two of the corners of said body a second metallized area in contact with said tabs projecting toward the remaining corners of said body, said first metallized area and said second metallized area establishing electrical contact with different sets of said plates, and constituting terminals to said capacitor wherein an edge dimension of each of said tabs is large compared to the spacing between adjacent tabs of two succeeding plates along a side of said body so as to keep the angle between the incoming and outgoing current close to 180°, thereby minimizing the mutual inductance, and wherein said capacitor has low inductance.
Claim 3
Dependent Claim 14 words
The capacitor of claim 1 wherein said dielectric material of said body is ceramic.
Claim 4
Dependent Claim 13 words
The capacitor of claim 2 wherein said ceramic dielectric material is barium titanate.
Claim 5
Dependent Claim 14 words
The capacitor of claim 1 wherein said dielectric material is an organic resin material.
Claim 6
Dependent Claim 17 words
The capacitor of claim 1 wherein aid first and said second metallized areas are coated with solder.
Claim 7
Dependent Claim 25 words
The capacitor of claim 1 wherein said plates have a plurality of parallel narrow slots emanating from the side of said plate opposite said tab.
Claim 8
Dependent Claim 26 words
The capacitor of claim 1 wherein the tabs of said plates are arranged in a sequence of four, wherein the tabs serially project toward different corners.
Claim 9
Dependent Claim 209 words
A low inductance capacitor having a body with a prismatic or polyhedral shape, and including a plurality of internal capacitor plates positioned and maintained in spaced relation with dielectric material, each plate provided with a tab having an end exposed on at least one side of said body, the improvement comprising, each of said plates having said tab projecting diagonally to a corner of said body and having an edge exposed, said plates arranged within said body with said tabs of each successive plate projecting to different corners of said body, a first metallized area in contact with said tabs projecting toward at least one of two of the corners of said body, a second metallized area in contact with said tabs projecting toward the remaining corners of said body, said first metallized area and said second metallized area establishing electrical contact with different sets of said plates, and constituting terminals to said capacitor wherein an edge dimension of each of said tabs is large compared to the spacing between adjacent tabs of two succeeding plates along a side of said body, wherein said capacitor has low inductance, and wherein the tabs of said plates are arranged in a sequence of two, wherein the tabs alternate toward adjacent corners.
Claim 10
Dependent Claim 209 words
A low inductance capacitor having a body with a prismatic or polyhedral shape, and including a plurality of internal capacitor plates positioned and maintained in spaced relation with dielectric material, each plate provided with a tab having an end exposed on at least one side of said body, the improvement comprising, each of said plates having said tab projecting diagonally to a corner of said body and having an edge exposed, said plates arranged within said body with said tabs of each successive plate projecting to different corners of said body, a first metallized area in contact with said tabs projecting toward at least one of two of the corners of said body, a second metallized area in contact with said tabs projecting toward the remaining corners of said body, said first metallized area and said second metallized area establishing electrical contact with different sets of said plates, and constituting terminals to said capacitor wherein an edge dimension of each of said tabs is large compared to the spacing between adjacent tabs of two succeeding plates along a side of said body, wherein said capacitor has low inductance, and wherein the tabs of said plates are arranged in a sequence of two, wherein the tabs alternate toward adjacent corners.
Claim 11
Dependent Claim 16 words
The capacitor of claim 8 wherein each of said plates is a layer of Ag-Pd alloy.
Claim 12
Dependent Claim 46 words
The capacitor of claim 8 wherein said terminals of said capacitors are each a metal coating covering approximately one third of the exterior area of said body, each terminal in electrical contact with said tabs of said plates projecting to only 2 corners of said body.
Claim 13
Dependent Claim 216 words
A low inductance capacitor having a body with a prismatic or polyhedral shape, and including a plurality of internal capacitor plates positioned and maintained in spaced relation with dielectric material, each plate provided with a tab having an end exposed on at least one side of said body, the improvement comprising, each of said plates having said tab projecting diagonally to a corner of said body and having an edge exposed, said plates arranged within said body with said tabs of each successive plate projecting to different corners of said body, a first metallized area in contact with said tabs projecting toward at least one of two of the corners of said body, a second metallized area in contact with said tabs projecting toward the remaining corners of said body, said first metallized area and said second metallized area establishing electrical contact with different sets of said plates, and constituting terminals to said capacitor wherein an edge dimension of each of said tabs is large compared to the spacing between adjacent tabs of two succeeding plates along a side of said body, wherein said capacitor has low inductance, and wherein each of said plates is defined as a square or rectangular shape but having a triangular corner area removed, said corner area being adjacent said tab.
Claim 14
Dependent Claim 216 words
A low inductance capacitor having a body with a prismatic or polyhedral shape, and including a plurality of internal capacitor plates positioned and maintained in spaced relation with dielectric material, each plate provided with a tab having an end exposed on at least one side of said body, the improvement comprising, each of said plates having said tab projecting diagonally to a corner of said body and having an edge exposed, said plates arranged within said body with said tabs of each successive plate projecting to different corners of said body, a first metallized area in contact with said tabs projecting toward at least one of two of the corners of said body, a second metallized area in contact with said tabs projecting toward the remaining corners of said body, said first metallized area and said second metallized area establishing electrical contact with different sets of said plates, and constituting terminals to said capacitor wherein an edge dimension of each of said tabs is large compared to the spacing between adjacent tabs of two succeeding plates along a side of said body, wherein said capacitor has low inductance, and wherein each of said plates is defined as a square or rectangular shape but having a triangular corner area removed, said corner area being adjacent said tab.

References Cited (Backward Citations)

FR885756A Cited
US2608601A Cited
US3098955A Cited
US3118095A Cited
US3444436A Cited
US3859592A Cited
US4082906A Cited
US4551746A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1992-03-20 1992-09-19 1993-03-21 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1996-03-20 1996-09-19 1997-03-21 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 2000-03-20 2000-09-19 2001-03-21 $7700.00 Window Closed / Lapsed

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