US2383620A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cooling system for vacuum tubes
Assignee: Induction Heating Corp
•
Filing: 1943-05-27
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Granted: 1945-08-28
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Expires: 1963-05-27
Abstract
No abstract record available.
Inventors
- 👤 Wallace C Rudd
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 08:34
CPC Classifications
H; H01; H01J; H01J7/00; H01J7/24
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) | 1948-08-27 | 1949-02-26 | 1949-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1952-08-27 | 1953-02-26 | 1953-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1956-08-27 | 1957-02-26 | 1957-08-28 | $7700.00 | Window Closed / Lapsed |