US4245275A
Expired / Lapsed
US
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Refractory metal alloy case capacitor
Assignee: Philips North America LLC
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Filing: 1978-06-23
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Granted: 1981-01-13
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Expires: 1998-06-23
Abstract
Abstract A liquid electrolyte porous anode capacitor having a tantalum alloy metal case which is acid resistant and having a porous film-forming coating on the internal surface thereof. The capacitor provides favorable performance to the prior all tantalum case wet slug capacitor.
Inventors
- 👤 Henry T. Cannon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 08:45
CPC Classifications
H; H01; H01G; H01G9/00; H01G9/004; H01G9/04; H01G9/042; H01G9/0425
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
58 words
In an electrolytic capacitor comprising a porous refractory metal anode submerged in an electrolyte, said electrolyte and anode being contained in a refractory metal case, said case having a porous metal coating internally thereof, the improvement comprising: said case consisting essentially of an alloy of tantalum-niobium and having a porous film forming coating on the internal surfaces thereof.
Claim 2
Dependent Claim
58 words
In an electrolytic capacitor comprising a porous refractory metal anode submerged in an electrolyte, said electrolyte and anode being contained in a refractory metal case, said case having a porous metal coating internally thereof, the improvement comprising: said case consisting essentially of an alloy of tantalum-niobium and having a porous film forming coating on the internal surfaces thereof.
Claim 3
Dependent Claim
20 words
The capacitor as recited in claim 1 wherein said alloy is a tantalum-niobium alloy and said porous coating is tantalum.
Claim 4
Dependent Claim
19 words
The capacitor as recited in claim 2 wherein said case includes at least about 60% by weight of tantalum.
Claim 5
Dependent Claim
35 words
The capacitor as recited in claim 3 wherein said electrolyte is sulphuric acid and includes as an additive a sulfate of a metal selected from the group consisting of titanium, vanadium, tungsten, niobium, and zirconium.
Claim 6
Dependent Claim
10 words
The capacitor of claim 4 wherein said sulphate is titanium.
Claim 7
Dependent Claim
16 words
The capacitor as recited in claim 5 wherein said case is closed by a glass-to-metal seal.
Claim 8
Dependent Claim
24 words
The capacitor of claim 1 wherein said alloy consists essentially of about, by weight, 26-29% tantalum, 10-12% tungsten, 0.6-1.1% zirconium, and the balance niobium.
Claim 9
Dependent Claim
13 words
The capacitor of claim 7 wherein said electrolyte consists essentially of lithium chloride.
Claim 10
Dependent Claim
23 words
The capacitor of claim 1 wherein said alloy consists essentially of about, by weight, 28% tantalum, 10.5% tungsten, 0.9% zirconium, and 62% niobium.
Claim 11
Dependent Claim
21 words
The capacitor of claim 1, wherein said alloy consists essentially of about, by weight, 80% niobium, 10% tungsten, and 10% tantalum.
Claim 12
Dependent Claim
19 words
The capacitor of claim 1 wherein said alloy consists essentially of about, by weight, 60% tantalum, and 40% niobium.
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) | 1984-01-13 | 1984-07-14 | 1985-01-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-01-13 | 1988-07-14 | 1989-01-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-01-13 | 1992-07-14 | 1993-01-13 | $7700.00 | Window Closed / Lapsed |