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Patent US2457218A successfully refreshed from Google Patents.
US2457218A
Expired / Lapsed
US
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Method of manufacturing sealed contact devices
Assignee: AT&T Inc
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Filing: 1944-12-14
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Granted: 1948-12-28
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Expires: 1964-12-14
Abstract
No abstract record available.
Inventors
- 👤 Enoch B Ferrell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:16
CPC Classifications
H; H01; H01H; H01H11/00; H01H11/005; Y; Y10; Y10S; Y10S65/00; Y10S65/12; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49105
Claims Analysis
Total Claims: 0
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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) | 1951-12-28 | 1952-06-28 | 1952-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-12-28 | 1956-06-28 | 1956-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-12-28 | 1960-06-28 | 1960-12-28 | $7700.00 | Window Closed / Lapsed |