Patent US389235A successfully refreshed from Google Patents.
US2587331A
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High-frequency electrical heating method and apparatus
Assignee: General Electric Co
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Filing: 1947-08-08
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Granted: 1952-02-26
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Expires: 1967-08-08
Abstract
No abstract record available.
Inventors
- 👤 Jordan John Paul
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 19:28
CPC Classifications
H; H05; H05H; H05H1/00; H05H1/24; H05H1/26; H05H1/30; B; B23; B23K; B23K10/00; B23K28/00; B23K28/02; H05B; H05B7/00; H05B7/18; H05B7/185
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1947267A
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US1570803A
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AT128301B
Cited
US2060842A
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US2052796A
Cited
AT149535B
Cited
US2095651A
Cited
US2127229A
Cited
US2215108A
Cited
GB544326A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-02-25 | 1955-08-27 | 1956-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-02-25 | 1959-08-27 | 1960-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-02-25 | 1963-08-27 | 1964-02-26 | $7700.00 | Window Closed / Lapsed |