Patent US2108219A successfully refreshed from Google Patents.
US2108219A
Expired / Lapsed
US
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Gas tube circuits
Assignee: AT&T Inc
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Filing: 1936-07-03
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Granted: 1938-02-15
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Expires: 1956-07-03
Abstract
No abstract record available.
Inventors
- 👤 Leland K Swart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:57
CPC Classifications
H; H03; H03B; H03B7/00; H03B7/02; H03B7/10; H03K; H03K3/00; H03K3/02; H03K3/37; Y; Y10; Y10S; Y10S84/00; Y10S84/13
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) | 1941-02-14 | 1941-08-16 | 1942-02-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1945-02-14 | 1945-08-16 | 1946-02-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1949-02-14 | 1949-08-16 | 1950-02-15 | $7700.00 | Window Closed / Lapsed |