US2106793A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filter including space discharge device
Assignee: AT&T Inc
•
Filing: 1934-12-26
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Granted: 1938-02-01
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Expires: 1954-12-26
Abstract
No abstract record available.
Inventors
- 👤 Everett T Burton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:28
CPC Classifications
H; H02; H02M; H02M1/00; H02M1/14; H02M1/15
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) | 1941-01-31 | 1941-08-02 | 1942-02-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1945-01-31 | 1945-08-02 | 1946-02-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1949-01-31 | 1949-08-02 | 1950-02-01 | $7700.00 | Window Closed / Lapsed |