US3770568A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Glass seals
Assignee: General Electric Co
•
Filing: 1971-10-13
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Granted: 1973-11-06
•
Expires: 1991-10-13
Abstract
Abstract Seal glass compositions directly sealable to tantalum and suitable for use as parts of hermetically sealed tantalum electrolytic capacitors, including an effective amount of chromic oxide.
Inventors
- 👤 W Graff
- 👤 J Kohut
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:53
CPC Classifications
C; C03; C03C; C03C27/00; C03C27/02; C03C3/00; C03C3/04; C03C3/076; C03C3/089; C03C3/091; Y; Y10; Y10T; Y10T428/00; Y10T428/13; Y10T428/131
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
16 words
The hermetic seal as set forth in claim 1 wherein the material is a metallic body.
Claim 2
Dependent Claim
14 words
The hermetic seal as set forth in claim 1 wherein the material is tantalum.
Claim 3
Dependent Claim
16 words
The hermetic seal as set forth in claim 1 wherein the material is polycrystalline sintered alumina.
Claim 4
Dependent Claim
16 words
The hermetic seal as set forth in claim 1 wherein the material is a ceramic body.
Claim 5
Dependent Claim
27 words
The hermetic seal as set forth in claim 1 wherein the seal is made between a pair of sintered alumina ceramic tubes fusion-sealed together by the glass.
References Cited (Backward Citations)
US2937100A
Cited
US2846325A
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US3275359A
Cited
US3275358A
Cited
US3420684A
Cited
US3647491A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-11-05 | 1977-05-07 | 1977-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-05 | 1981-05-07 | 1981-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-05 | 1985-05-07 | 1985-11-06 | $7700.00 | Window Closed / Lapsed |