Patent US1430808A successfully refreshed from Google Patents.
US1430808A
Expired / Lapsed
US
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Two-way impedance equalizer for transformers
Assignee: AT&T Inc
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Filing: 1918-11-29
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Granted: 1922-10-03
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Expires: 1938-11-29
Abstract
No abstract record available.
Inventors
- 👤 Ray S Hoyt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 17:01
CPC Classifications
H; H04; H04B; H04B3/00; H04B3/02; H04B3/04; H04B3/14; H04B3/143
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) | 1925-10-02 | 1926-04-03 | 1926-10-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1929-10-02 | 1930-04-03 | 1930-10-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1933-10-02 | 1934-04-03 | 1934-10-03 | $7700.00 | Window Closed / Lapsed |