US3522550A
Expired / Lapsed
US
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High frequency heating device including a self-excited velocity modulation tube generator for continuous operation
Assignee: US Philips Corp
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Filing: 1967-09-28
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Granted: 1970-08-04
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Expires: 1987-09-28
Abstract
No abstract record available.
Inventors
- 👤 Werner Golombek
- 👤 Franciscus Timmermans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 08:26
CPC Classifications
H; H05; H05B; H05B6/00; H05B6/64; H05B6/70; H05B6/705; H01; H01J; H01J23/00; H01J23/36; H01P; H01P5/00; H01P5/04; H03; H03B; H03B9/00; H03B9/01; H03B9/10; H05B6/66; H05B6/68; H05B6/688; H05B6/707; Y; Y02; Y02B; Y02B40/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-08-03 | 1974-02-02 | 1974-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-08-03 | 1978-02-02 | 1978-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-08-03 | 1982-02-02 | 1982-08-04 | $7700.00 | Window Closed / Lapsed |