Patent US1922029A successfully refreshed from Google Patents.
US1922029A
Expired / Lapsed
US
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Protective device for induction furnace
Assignee: Ajax Electrothermic Corp
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Filing: 1931-07-22
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Granted: 1933-08-15
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Expires: 1951-07-22
Abstract
No abstract record available.
Inventors
- 👤 Chesnut Frank Theodore
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:02
CPC Classifications
H; H05; H05B; H05B6/00; H05B6/02; H05B6/22; H05B6/24; F; F27; F27B; F27B3/00; F27B3/08; F27D; F27D11/00; F27D11/06; F27D19/00; F27D21/00; F27D21/0021; F27D21/04; F27D2021/0057; F27D2021/0085
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) | 1936-08-14 | 1937-02-13 | 1937-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1940-08-14 | 1941-02-13 | 1941-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1944-08-14 | 1945-02-13 | 1945-08-15 | $7700.00 | Window Closed / Lapsed |