US2573247A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Means for signal amplifying and mixing utilizing space charge neutralization
Assignee: RCA Corp
•
Filing: 1949-01-03
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Granted: 1951-10-30
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Expires: 1969-01-03
Abstract
No abstract record available.
Inventors
- 👤 John H Coleman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 00:16
CPC Classifications
H; H01; H01J; H01J25/00; H01J25/02; H03; H03D; H03D7/00; H03D7/20
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-10-29 | 1955-04-30 | 1955-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-10-29 | 1959-04-30 | 1959-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-10-29 | 1963-04-30 | 1963-10-30 | $7700.00 | Window Closed / Lapsed |