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US2742818A
Expired / Lapsed
US
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Radiation band selector
Assignee: Cambridge Thermionic Corp
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Filing: 1951-09-11
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Granted: 1956-04-24
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Expires: 1971-09-11
Abstract
No abstract record available.
Inventors
- 👤 Jr Cornelius S Hurlbut
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 06:32
CPC Classifications
G; G02; G02B; G02B27/00; G02B27/28; G02B27/288
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) | 1959-04-24 | 1959-10-24 | 1960-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-04-24 | 1963-10-24 | 1964-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-04-24 | 1967-10-24 | 1968-04-24 | $7700.00 | Window Closed / Lapsed |