US3700420A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ceramic-to-metal seal
Assignee: General Electric Co
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Filing: 1971-04-01
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Granted: 1972-10-24
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Expires: 1991-04-01
Abstract
Abstract A CERAMIC-TO-METAL SEAL IS DESCRIBED WHICH COMPRISES A SILVER-MANGANESE-COPPER ALLOY. METAL MAY BE SEALED TO CERAMIC IN A ONE STEP PROCESS WITHOUT PRIOR METALLIZING OF THE CERAMIC. THE ALLOY MELTS AT TEMPERATURES WHICH ARE SUFFICIENTLY BELOW THE MELTING POINT OF SILVER TO ENABLE ONE TO SEAL SILVER-PLATED METAL PARTS TO CERAMIC WITHOUT MELTING THE SILVER PLATING.
Inventors
- 👤 Robert H Bristow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 13:23
CPC Classifications
C; C04; C04B; C04B37/00; C04B37/02; C04B37/023; C04B37/026; C04B2237/00; C04B2237/02; C04B2237/12; C04B2237/125; C04B2237/30; C04B2237/32; C04B2237/34; C04B2237/341; C04B2237/343; C04B2237/40; C04B2237/405; C04B2237/50; C04B2237/72; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12535; Y10T428/12611; Y10T428/12618; Y10T428/12771; Y10T428/12778; Y10T428/12861; Y10T428/12896
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-10-24 | 1976-04-24 | 1976-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-24 | 1980-04-24 | 1980-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-24 | 1984-04-24 | 1984-10-24 | $7700.00 | Window Closed / Lapsed |