US4315974A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrochemical cell with protected electrical feedthrough
Assignee: Medtronic Inc
•
Filing: 1978-05-01
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Granted: 1982-02-16
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Expires: 1998-05-01
Abstract
Abstract Electrical feedthrough seal, such as a glass-to-metal seal, including a protective ceramic body which shields at least portions of the inner surfaces of the glass seal. The ceramic body is preferably disposed about the lead-wire of the feedthrough.
Inventors
- 👤 Lee F. Athearn
- 👤 William J. Morrissey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:34
CPC Classifications
H; H01; H01M; H01M50/00; H01M50/10; H01M50/183; H01M50/186; H01M50/19; H01M50/191; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
128 words
An electrochemical cell comprising a case including electrode means; electrode lead-wire means extending into the case from the exterior thereof to contact the electrode means; glass seal means around the lead-wire means at its point of entry into the case with an inner glass portion extending inside the case, and ceramic cover means surrounding the lead-wire means and extending between the glass and the electrode means, the ceramic cover means being fused to the inner glass portion of the glass seal means inside the case and shielding those inner portions of the glass inside the case which are exposed to cell contents which tend to react with the glass whereby reaction between the cell contents and the glass and the cell contents and the lead-wire means is avoided.
Claim 2
Dependent Claim
128 words
An electrochemical cell comprising a case including electrode means; electrode lead-wire means extending into the case from the exterior thereof to contact the electrode means; glass seal means around the lead-wire means at its point of entry into the case with an inner glass portion extending inside the case, and ceramic cover means surrounding the lead-wire means and extending between the glass and the electrode means, the ceramic cover means being fused to the inner glass portion of the glass seal means inside the case and shielding those inner portions of the glass inside the case which are exposed to cell contents which tend to react with the glass whereby reaction between the cell contents and the glass and the cell contents and the lead-wire means is avoided.
Claim 3
Dependent Claim
13 words
The cell of claim 1 wherein the ceramic cover is comprised of alumina.
Claim 4
Dependent Claim
15 words
The cell of claim 1 wherein the electrode means includes an anode comprised of lithium.
Claim 5
Dependent Claim
20 words
The cell of claim 1 wherein the electrode means includes a cathode comprised of an organic complex compound including iodine.
Claim 6
Dependent Claim
11 words
The cell of claim 3 wherein the ceramic cover is cup-shaped.
Claim 7
Dependent Claim
25 words
The cell of claim 4 wherein the electrode means includes a lithium anode and the complex compound of the cathode substantially surrounds the lithium anode.
Claim 8
Dependent Claim
33 words
The cell of claim 3 wherein the glass seal means comprises a glass portion and a separate peripheral metal portion sealed to the glass, the metal portion being also sealed to the case.
References Cited (Backward Citations)
US3421945A
Cited
US3416964A
Cited
US3874929A
Cited
US4112204A
Cited
US4061841A
Cited
US4128703A
Cited
US4168351A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-02-15 | 1985-08-17 | 1986-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-02-15 | 1989-08-17 | 1990-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-02-15 | 1993-08-17 | 1994-02-16 | $7700.00 | Window Closed / Lapsed |