US2776343A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multi-purpose vacuum tube variable gain amplifier
Assignee: Individual
•
Filing: 1953-05-04
•
Granted: 1957-01-01
•
Expires: 1973-05-04
Abstract
No abstract record available.
Inventors
- 👤 Yuni William
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 02:39
CPC Classifications
H; H03; H03G; H03G1/00; H03G1/0005; H03G1/0011
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2092496A
Cited
US2162878A
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US2284102A
Cited
US2419812A
Cited
US2396224A
Cited
US2516865A
Cited
US2464594A
Cited
GB630123A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-01-01 | 1960-07-02 | 1961-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-01-01 | 1964-07-02 | 1965-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-01-01 | 1968-07-02 | 1969-01-01 | $7700.00 | Window Closed / Lapsed |