US2258437A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas tube
Assignee: AT&T Inc
•
Filing: 1940-08-29
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Granted: 1941-10-07
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Expires: 1960-08-29
Abstract
No abstract record available.
Inventors
- 👤 Robert H Badgley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 02:24
CPC Classifications
H; H01; H01H; H01H51/00; H01H51/28; A; A01; A01G; A01G31/00; A01G31/02; A01G31/06; H01H51/30; H01H51/32; H01J; H01J17/00; H01J17/38; H01J17/40; A01G31/065; Y; Y02; Y02P; Y02P60/00; Y02P60/20; Y02P60/21
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) | 1944-10-06 | 1945-04-07 | 1945-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1948-10-06 | 1949-04-07 | 1949-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1952-10-06 | 1953-04-07 | 1953-10-07 | $7700.00 | Window Closed / Lapsed |