US3593068A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bus bar transistor and method of making same
Assignee: International Business Machines Corp
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Filing: 1967-12-06
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Granted: 1971-07-13
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Expires: 1987-12-06
Abstract
Abstract A transistor has its emitter formed as parallel strips in the surface of the body of the base with a first level of electrical contact for the emitter comprising parallel elongated members connected to each of the strips. The first level of electrical contact for the base comprises parallel elongated members extending parallel to each of the emitter elongated members and disposed between the emitter elongated members and on the outer sides of the two outermost emitter elongated members. The first level of electrical contact for the base also includes a rectangular shaped member, which contacts the ends of all of the base elongated members and the sides of the two outermost base elongated members. An electrical insulating layer is disposed over the first level of contacts and has holes therein to permit each of the emitter elongated members to be connected to a bus bar on a second level. Each of the sides of the rectangular shaped member is connected through holes in the insulating layer to a bus bar that forms a second level base contact.
Inventors
- 👤 Laurence L Rosier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:37
CPC Classifications
H; H10; H10W; H10W20/00; H10W20/40; H10D; H10D10/00; H10D10/01; H10D10/051; H10D10/056; H10D10/058; H10D99/00
Claims Analysis
Total Claims: 31
Claim 1
Independent Claim
45 words
The conducting means according to claim 1 in which: said first contact means comprises a plurality of elongated members disposed substantially parallel to each other; and said insulating means has openings therein to permit said third contact means to contact each of said elongated members.
Claim 2
Dependent Claim
44 words
The conducting means according to claim 1 in which: said second contact means substantially surrounds and is interposed between said first contact means; and said insulating means has openings therein to permit said fourth contact means to engage portions of said second contact means.
Claim 3
Dependent Claim
93 words
The conducting means according to claim 2 in which: said second contact means comprises: elongated members disposed between said elongated members of said first contact means and substantially parallel to said elongated members of said first contact means; and means surrounding said elongated members of said first contact means and said elongated members of said second contact means, said surrounding means being connected to the ends of said elongated members of said second contact means; and said insulating means has openings therein to permit said fourth contact means to engage said surrounding means.
Claim 4
Dependent Claim
176 words
Conducting means for making electrical contact to a semiconductor body at a first region of one conductivity type and a second region of another conductivity type comprising: first contact means comprising a plurality of spaced contact members of electrically conductive material adapted to ohmically contact the first region; second contact means electrically insulated from said first contact means and adapted to ohmically contact the second region, said second contact means comprising: a plurality of spaced contact members of electrically conductive material disposed between said spaced contact members of said first contact means; and means surrounding said spaced contact members of said first contact means and connected to each end of said spaced contact members of said second contact means; third contact means of electrically conductive material ohmically connected to each of said spaced contact members of said first contact means and electrically insulated from said second contact means; and fourth contact means of electrically conductive material ohmically connected to said second contact means and electrically insulated from said first contact means and said third contact means.
Claim 5
Dependent Claim
24 words
The conducting means according to claim 5 in which each of said spaced contact members of said first contact means comprises an elongated member.
Claim 6
Dependent Claim
18 words
The conducting means according to claim 6 in which said elongated members are substantially parallel to each other.
Claim 7
Dependent Claim
50 words
The conducting means according to claim 7 in which: each of sAid spaced contact members of said second contact means is an elongated member; and said elongated members of said second contact means are disposed substantially parallel to each other and to said elongated members of said first contact means.
Claim 8
Dependent Claim
23 words
The conducting means according to claim 8 in which said surrounding means of said contact means has the shape of a right-angled parallelogram.
Claim 9
Dependent Claim
154 words
A semiconductor structure comprising; a semiconductor body having a surface of one conductivity type; a plurality of spaced strips of another conductivity type formed in said surface; a first group of elongated members of electrically conductive material with each of said elongated members ohmically connected to one of said strips; second means of electrically conductive material ohmically connected to said surface of said body, said second means surrounding and extending between said strips; first electrical insulating means to insulate said first group of elongated members from said second means; second electrical insulating means disposed over said first group of said elongated members and said second means; first electrically conducting means disposed exteriorly of said second insulating means and ohmically connected through said second insulating means to each of said elongated members of said first group; and second electrically conducting means disposed exteriorly of said second insulating means and ohmically connected to said second means.
Claim 10
Dependent Claim
65 words
The semiconductor structure according to claim 10 in which: said second means of electrically conductive material comprises: a second group of elongated members extending between said strips; and means surrounding said elongated members of said second group and connected to each end of each of said elongated members of said second group; and said second electrically conductive means is ohmically connected to said surrounding means.
Claim 11
Dependent Claim
54 words
The semiconductor structure according to claim 11 in which: said spaced strips are substantially parallel to each other; said elongated members of said first group are substantially parallel to each other; and said elongated members of said second group are substantially parallel to each other and to said elongated members of said first group.
Claim 12
Independent Claim
292 words
A method for forming electrical contacts for a semiconductor device having a semiconductor body of one conductivity type and strips of a second conductivity type formed in the surface of the body, said method comprising: coating the surface of the body and the strips with a first layer of electrical insulating material; forming first openings in the insulating material for communication with each of the strips separately; forming second openings in the insulating material for communication with the body in areas spaced from the strips; placing electrically conductive material in communication with each of the strips through the first openings in the insulating material to form spaced electrical contacts; placing electrically conductive material in communication with the body through the second openings in the insulating material to form electrical contact means; adding a second layer of electrical insulating material over the first layer of insulating material, the spaced electrical contacts for the strips, and the electrical contact means for the body; forming first openings in the second layer of insulating material for communication with the spaced electrical contacts; forming second openings in the second layer of insulating material for communication with the electrical contact means of the body with the second openings in the second layer of insulating means being spaced from the first openings in the second layer of insulating means; placing electrically conductive material in communication with the spaced electrical contacts through the first openings in the second layer of insulating material to form a second levEl electrical contact means for the strips; and placing electrically conductive material in communication with the electrical contact means of the body through the second openings in the second layer of insulating material to form a second level electrical contact means for the body.
Claim 13
Dependent Claim
57 words
The method according to claim 13 including: forming the first openings in the first layer of insulating material substantially parallel to each other; and forming the first openings in the second layer of insulating material directly above the first openings in the first layer of insulating material and of a smaller size than the spaced electrical contacts.
Claim 14
Dependent Claim
50 words
The method according to claim 13 including forming the second openings in the first layer of insulating material both between the first openings in the first layer of insulating material and on the outer side of the two outermost of the first openings in the first layer of insulating material.
Claim 15
Dependent Claim
49 words
The method according to claim 14 including forming the second openings in the first layer of insulating material between the first openings in the first layer of insulating material and on the outer side of the two outermost of the first openings in the first layer of insulating material.
Claim 16
Dependent Claim
39 words
The method according to claim 13 in which: all of the openings in the first layer of insulating material are formed substantially simultaneously: and all of the openings in the second layer of insulating material are formed substantially simultaneously.
Claim 17
Dependent Claim
49 words
The method according to claim 17 in which: all of the electrically conductive material is deposited through the openings in the first layer of insulating material substantially simultaneously; and all of the electrically conductive material is deposited through the openings in the second layer of insulating material substantially simultaneously.
Claim 18
Dependent Claim
143 words
The conducting means according to claim 2 in which: said third contact means comprises: a plurality of elongated members, each of said elongated members having one surface disposed in ohmic contact with a corresponding one of said elongated members of said first contact means, each of said elongated members of said third contact means extending for only the central portion of the length of said elongated member of said first contact means with which it is in ohmic contact; and a bus bar contacting the opposite parallel surface to said one surface of each of said elongated members of said third contact means to cause current to flow from the first region to said bus bar in a direction substantially perpendicular to each of said elongated members of said first contact means and each of said elongated members of said third contact means.
Claim 19
Dependent Claim
42 words
The conducting means according to claim 19 in which each of said elongated members of said third contact means has a width less than the width of said elongated member of said first contact means with which it is in ohmic contact.
Claim 20
Dependent Claim
174 words
The conducting means according to claim 4 in which: said third contact means comprises: a plurality of elongated members, each of said elongated members having one surface disposed in ohmic contact with a corresponding one of said elongated members of said first contact means, each of said elongated members of said third contact means extending for only the central portion of the length of said elongated member of said first contact means with which it is in ohmic contact; and a bus bar contacting the opposite parallel surface to said one surface of each of said elongated members of said third contact means to cause current to flow from the first region to said bus bar in a direction substantially perpendicular to each of said elongated members of said first contact means and each of said elongated members of said third contact means; said surrounding means of said second contact means is polygonal shaped; and said fourth contact means comprises a bus bar engaging each of the siDes of said polygonal shaped surrounding means.
Claim 21
Dependent Claim
42 words
The conducting means according to claim 21 in which each of said elongated members of said third contact means has a width less than the width of said elongated member of said first contact means with which it is in ohmic contact.
Claim 22
Dependent Claim
143 words
The conducting means according to claim 6 in which: said third contact means comprises: a plurality of elongated members, each of said elongated members having one surface disposed in ohmic contact with a corresponding one of said elongated members of said first contact means, each of said elongated members of said third contact means extending for only the central portion of the length of said elongated member of said first contact means with which it is in ohmic contact; and a bus bar contacting the opposite parallel surface to said one surface of each of said elongated members of said third contact means to cause current to flow from the first region to said bus bar in a direction substantially perpendicular to each of said elongated members of said first contact means and each of said elongated members of said third contact means.
Claim 23
Dependent Claim
42 words
The conducting means according to claim 23 in which each of said elongated members of said third contact means has a width less than the width of said elongated member of said first contact means with which it is in ohmic contact.
Claim 24
Dependent Claim
161 words
The conducting means according to claim 9 in which: said third contact means comprises: a plurality of elongated members, each of said elongated members having one surface disposed in ohmic contact with a corresponding one of said elongated members of said first contact means, each of said elongated members of said third contact means extending for only the central portion of the length of said elongated member of said first contact means with which it is in ohmic contact; and a bus bar contacting the opposite parallel surface to said one surface of each of said elongated members of said third contact means to cause current to flow from the first region to said bus bar in a direction substantially perpendicular to each of said elongated members of said first contact means and each of said elongated members of said third contact means; and said fourth contact means comprises a bus bar engaging each of the sides of said surrounding means.
Claim 25
Dependent Claim
42 words
The conducting means according to claim 25 in which each of said elongated members of said third contact means has a width less than the width of said elongated member of said first contact means with which it is in ohmic contact.
Claim 26
Dependent Claim
128 words
The semiconductor structure according to claim 10 in which: said first electrically conducting means comprises: a plurality of elongated members, each of said elongated members having one surface disposed in ohmic contact with a corresponding one of said elongated members of said first group, each of said elongated members of said first electrically conducting means extending for only the central portion of the length of said elongated member of said first group with which it is in ohmic contact; and a bus bar contacting the opposite parallel surface to said one surface of each of said elongated members of said first electrically conducting means to cause current to flow from each of said strips to said bus bar in a direction substantially perpendicular to each of said strips.
Claim 27
Dependent Claim
42 words
The semiconductor structure according to claim 27 in which each of said elongated members of said first electrically conducting means has a width less than the width of said elongated member of said first group with which it is in ohmic contact.
Claim 28
Dependent Claim
163 words
The semiconductor structure according to claim 12 in which: said first electrically conducting means comprises: a plurality of elongated members, each of said elongated members having one surface disposed in ohmic contact with a corresponding one of said elongated members of said first group, each of said elongated members of said first electrically conductiNg means extending for only the central portion of the length of said elongated member of said first group with which it is in ohmic contact; and a bus bar contacting the opposite parallel surface to said one surface of each of said elongated members of said first electrically conducting means to cause current to flow from each of said strips to said bus bar in a direction substantially perpendicular to each of said strips; said surrounding means of said second means of electrically conductive material being polygonal shaped; and said second electrically conducting means comprises a bus bar engaging each of the sides of said polygonal shaped surrounding means.
Claim 29
Dependent Claim
42 words
The semiconductor structure according to claim 29 in which each of said elongated members of said first electrically conducting means has a width less than the width of said elongated member of said first group with which it is in ohmic contact.
Claim 30
Dependent Claim
69 words
A transistor comprising: a collector; a base; an emitter, said emitter comprising a plurality of spaced parallel strips formed within said base; an emitter bus bar; and means to transfer current from each of said emitter strips to said emitter bus bar so that current flows from each of said emitter strips in a direction only substantially perpendicular to each of said emitter strips for substantially its entire length.
Claim 31
Dependent Claim
131 words
The transistor according to claim 31 in which: said current transfer means includes: a first group of separate elongated members, each of said elongated members being in ohmic contact with a corresponding one of said emitter strips; and a second group of separate elongated members, each of said elongated members of said second group having one surface in ohmic contact with a corresponding one of said elongated members of said first group and its opposite parallel surface in ohmic contact with said emitter bus bar; each of said elongated members of said second group extending for only the central portion of the length of each of said elongated members of said first group and having a width less than the width of each of said elongated members of said first group.
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) | 1974-07-12 | 1975-01-11 | 1975-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-12 | 1979-01-11 | 1979-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-12 | 1983-01-11 | 1983-07-13 | $7700.00 | Window Closed / Lapsed |