Patent US1328336A successfully refreshed from Google Patents.
US1328336A
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US
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Artificially-cooled high-frequency coil
Assignee: Ajax Metal Co
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Filing: 1919-04-18
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Granted: 1920-01-20
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Expires: 1939-04-18
Abstract
No abstract record available.
Inventors
- 👤 Edwin F Northrup
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 04:46
CPC Classifications
H; H01; H01F; H01F27/00; H01F27/08; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49826; Y10T29/49863; Y10T29/49865
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) | 1923-01-19 | 1923-07-21 | 1924-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1927-01-19 | 1927-07-21 | 1928-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1931-01-19 | 1931-07-21 | 1932-01-20 | $7700.00 | Window Closed / Lapsed |