Patent US3437947A successfully refreshed from Google Patents.
US3437947A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Signal amplifier having grounded-base stage for a cable terminating impedance
Assignee: Philips North America LLC
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Filing: 1967-11-02
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Granted: 1969-04-08
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Expires: 1987-11-02
Abstract
No abstract record available.
Inventors
- 👤 Henricus Ernest Beekman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:30
CPC Classifications
H; H03; H03F; H03F3/00; H03F3/50; H03F1/00; H03F1/34; H03F1/56; H03F1/565; H03F3/189; H03F3/19; H03F3/193; H03F3/1935
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3168656A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-04-07 | 1972-10-07 | 1973-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-04-07 | 1976-10-07 | 1977-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-04-07 | 1980-10-07 | 1981-04-08 | $7700.00 | Window Closed / Lapsed |