Patent US2985840A successfully refreshed from Google Patents.
US2985840A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gain control amplifier
Assignee: Ling-Temco Electronics Inc
•
Filing: 1958-10-23
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Granted: 1961-05-23
•
Expires: 1978-10-23
Abstract
No abstract record available.
Inventors
- 👤 Theodore Charles
- 👤 William W Caldwell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 23:55
CPC Classifications
H; H03; H03G; H03G3/00; H03G3/20; H03G3/22
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) | 1964-05-22 | 1964-11-21 | 1965-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-05-22 | 1968-11-21 | 1969-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-05-22 | 1972-11-21 | 1973-05-23 | $7700.00 | Window Closed / Lapsed |