Patent US1550906A successfully refreshed from Google Patents.
US1550906A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Instrument transformer
Assignee: Individual
•
Filing: 1922-05-01
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Granted: 1925-08-25
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Expires: 1942-05-01
Abstract
No abstract record available.
Inventors
- 👤 Otto A Knopp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 05:51
CPC Classifications
H; H01; H01F; H01F38/00; H01F38/20; H01F38/22; H01F38/28; H01F38/32; H01F27/00; H01F27/42; H01F27/422; H01F27/427
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) | 1928-08-24 | 1929-02-23 | 1929-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1932-08-24 | 1933-02-23 | 1933-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1936-08-24 | 1937-02-23 | 1937-08-25 | $7700.00 | Window Closed / Lapsed |