US2423902A
Expired / Lapsed
US
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High-frequency electric field heating apparatus
Assignee: JOSEPH N NIELSEN
•
Filing: 1943-07-21
•
Granted: 1947-07-15
•
Expires: 1963-07-21
Abstract
No abstract record available.
Inventors
- 👤 Thomas F Peterson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 01:06
CPC Classifications
H; H05; H05B; H05B6/00; H05B6/64; H05B6/78; Y; Y10; Y10S; Y10S264/00; Y10S264/43; Y10S65/00; Y10S65/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1806846A
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US1555258A
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US1807105A
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US2261847A
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US2087480A
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US2263681A
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US2275430A
Cited
US2291807A
Cited
US2298037A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-07-14 | 1951-01-13 | 1951-07-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-07-14 | 1955-01-13 | 1955-07-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-07-14 | 1959-01-13 | 1959-07-15 | $7700.00 | Window Closed / Lapsed |