US3553499A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fast-acting avalanche mode transistor switch
Assignee: Unisys Corp
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Filing: 1968-07-17
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Granted: 1971-01-05
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Expires: 1988-07-17
Abstract
Abstract A transistor suitable for operation in the avalanche mode is connected in a switching circuit through coaxial lines. The outer conductors of the coaxial lines are electrically bonded to a base member and the center conductors of the coaxial lines are bored out to receive the ends of the transistor leads directly.
Inventors
- 👤 Hugh C Maguire
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:58
CPC Classifications
H; H03; H03K; H03K3/00; H03K3/02; H03K3/335; H03K17/00; H03K17/04; H03K17/041; H03K17/04113
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
198 words
A fast-acting switch comprising a transistor capable of operation in the avalanche mode; said transistor being encapsulated in a cylindrical case and having three connecting leads projecting from one end thereof, said leads being arranged in a triangular configuration; individual coaxial cables corresponding to each transistor lead; a transistor end and a remote end on each coaxial cable; a center conductor in each coaxial cable having an axial bore at its transistor end, said center conductor having a uniform diameter larger than the diameter of the transistor leads, said axial bore receiving the corresponding transistor lead and being dimensioned to provide a low resistance friction fit for the transistor lead; said transistor ends of the coaxial cables being supported in a trefoil cluster with the cable axes substantially parallel to each other; said cables being further arranged so that the center conductors of the cables have substantially the same spacing as the connecting leads; an energy source coupled to the remote end of one of said cables; and means to actuate said transistor coupled to the remote end of another of said cables; and means to couple a load to the remote end of another of said cables.
Claim 2
Dependent Claim
198 words
A fast-acting switch comprising a transistor capable of operation in the avalanche mode; said transistor being encapsulated in a cylindrical case and having three connecting leads projecting from one end thereof, said leads being arranged in a triangular configuration; individual coaxial cables corresponding to each transistor lead; a transistor end and a remote end on each coaxial cable; a center conductor in each coaxial cable having an axial bore at its transistor end, said center conductor having a uniform diameter larger than the diameter of the transistor leads, said axial bore receiving the corresponding transistor lead and being dimensioned to provide a low resistance friction fit for the transistor lead; said transistor ends of the coaxial cables being supported in a trefoil cluster with the cable axes substantially parallel to each other; said cables being further arranged so that the center conductors of the cables have substantially the same spacing as the connecting leads; an energy source coupled to the remote end of one of said cables; and means to actuate said transistor coupled to the remote end of another of said cables; and means to couple a load to the remote end of another of said cables.
Claim 3
Dependent Claim
32 words
The switch of claim 1 in which the transistor is encapsulated in a type JEDEC TO-18 case and the coaxial cables are semirigid coaxial cables having an outside diameter of .085 inches.
Claim 4
Dependent Claim
66 words
The apparatus of claim 1 in which the transistor has base, collector and emitter elements and in which the base element is coupled to the actuating means through one of the coaxial cables, the collector element is coupled to the energy source through a second of the coaxial cables and the emitter element is connected directly to the load through a third of said coaxial cables.
Claim 5
Dependent Claim
135 words
A mount for a transistor containing three leads arranged in a triangular configuration, said mount comprising an electrically conducting mounting member; a cluster of coaxial cables mechanically supported near one end of each cable by said mounting member, said cluster including three coaxial cables arranged in a trefoil configuration; said coaxial cables each having an outside diameter substantially equal to the smallest spacing between the transistor leads; said cables being trimmed so that their supported ends lie in a common plane; said cables having their outer conductors in electrical contact with said mounting member; said cables having inner conductors with diameters greater than the diameters of the transistor leads; each of said inner conductors having an axial bore at their supported cable ends dimensioned to receive a transistor lead with a low resistance friction fit.
Claim 6
Dependent Claim
135 words
A mount for a transistor containing three leads arranged in a triangular configuration, said mount comprising an electrically conducting mounting member; a cluster of coaxial cables mechanically supported near one end of each cable by said mounting member, said cluster including three coaxial cables arranged in a trefoil configuration; said coaxial cables each having an outside diameter substantially equal to the smallest spacing between the transistor leads; said cables being trimmed so that their supported ends lie in a common plane; said cables having their outer conductors in electrical contact with said mounting member; said cables having inner conductors with diameters greater than the diameters of the transistor leads; each of said inner conductors having an axial bore at their supported cable ends dimensioned to receive a transistor lead with a low resistance friction fit.
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) | 1974-01-04 | 1974-07-06 | 1975-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-04 | 1978-07-06 | 1979-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-04 | 1982-07-06 | 1983-01-05 | $7700.00 | Window Closed / Lapsed |