US2808515A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical tuning device
Assignee: Allen B du Mont Laboratories Inc
•
Filing: 1952-10-10
•
Granted: 1957-10-01
•
Expires: 1972-10-10
Abstract
No abstract record available.
Inventors
- 👤 Clifford D Nestlerode
- 👤 David C Felt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:53
CPC Classifications
H; H03; H03J; H03J5/00; H03J5/24; H03J5/26; H03J5/30
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE541150C
Cited
US2297889A
Cited
US2385131A
Cited
US2513392A
Cited
US2643361A
Cited
US2600119A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-09-30 | 1961-04-01 | 1961-10-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-09-30 | 1965-04-01 | 1965-10-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-09-30 | 1969-04-01 | 1969-10-01 | $7700.00 | Window Closed / Lapsed |