Patent US3412348A successfully refreshed from Google Patents.
US3412348A
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US
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Variable attenuator
Assignee: GTE Sylvania Inc
•
Filing: 1965-05-03
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Granted: 1968-11-19
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Expires: 1985-05-03
Abstract
No abstract record available.
Inventors
- 👤 Richard W Hull
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 10:18
CPC Classifications
H; H03; H03G; H03G1/00; H03G1/0005; H03G1/0035; H03G1/0052; H03G1/0064; H03H; H03H7/00; H03H7/24; H03H7/25; H03H7/253; H03H7/256
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2270416A
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US2258974A
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US2762017A
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US2861245A
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GB817962A
Cited
US3049667A
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US3110004A
Cited
US3217275A
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US3188566A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-11-19 | 1972-05-20 | 1972-11-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-11-19 | 1976-05-20 | 1976-11-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-11-19 | 1980-05-20 | 1980-11-19 | $7700.00 | Window Closed / Lapsed |