Patent US2838640A successfully refreshed from Google Patents.
US2838640A
Expired / Lapsed
US
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Continuous immersion high frequency heating apparatus and process
Assignee: Individual
•
Filing: 1956-07-02
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Granted: 1958-06-10
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Expires: 1976-07-02
Abstract
No abstract record available.
Inventors
- 👤 Julius W Mann
- 👤 George F Russell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:59
CPC Classifications
H; H05; H05B; H05B6/00; H05B6/64; H05B6/78; H05B6/782; A; A23; A23B; A23B2/00; A23B2/05; A23B2/08; A23B7/00; A23B7/005; A23B7/01; A23B7/06; Y; Y10; Y10S; Y10S159/00; Y10S159/26
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2397615A
Cited
US2415025A
Cited
US2508365A
Cited
GB605589A
Cited
US2492187A
Cited
US2503779A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-06-09 | 1961-12-09 | 1962-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-09 | 1965-12-09 | 1966-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-09 | 1969-12-09 | 1970-06-10 | $7700.00 | Window Closed / Lapsed |