Patent US1320980A successfully refreshed from Google Patents.
US1320980A
Expired / Lapsed
US
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Transformer.
Assignee: AT&T Inc
•
Filing: 1918-09-21
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Granted: 1919-11-04
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Expires: 1938-09-21
Abstract
No abstract record available.
Inventors
- 👤 Herman N Bowman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:42
CPC Classifications
H; H01; H01F; H01F27/00; H01F27/34; H01F27/36; H01F27/363; Y; Y10; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249953; Y10T428/249987; Y10T428/24999
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) | 1922-11-03 | 1923-05-05 | 1923-11-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1926-11-03 | 1927-05-05 | 1927-11-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1930-11-03 | 1931-05-05 | 1931-11-04 | $7700.00 | Window Closed / Lapsed |