US513420A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of cooling the iron of transformers
Assignee: —
•
Filing: —
•
Granted: 1894-01-23
•
Expires: 1911-01-23
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:10
CPC Classifications
H; H01; H01F; H01F27/00; H01F27/24; H01F27/245; H01F27/08; H01F27/10; H01F27/16; H01F27/22
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) | 1897-01-22 | 1897-07-24 | 1898-01-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1901-01-23 | 1901-07-25 | 1902-01-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1905-01-23 | 1905-07-25 | 1906-01-24 | $7700.00 | Window Closed / Lapsed |