US3564423A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multiband varactor tv tuner
Assignee: US Philips Corp
•
Filing: 1968-04-10
•
Granted: 1971-02-16
•
Expires: 1988-04-10
Abstract
Abstract A MULTIPLE BAND TUNING CIRCUIT HAVING RESONANT CIRCUITS FOR EACH BAND THAT ARE CONNECTED TO BE TUNED BY SEPARATE VOLTAGE DEPENDENT REACTANCES. THE HIGHER FREQUENCY RESONANT CIRCUITS ARE TAPPED, AND ARE CONNECTED IN THE CIRCUIT TO FORM SEPARATE BRIDGE CIRCUITS, WITH THE TAPS BEING POSITIONED SO THAT EACH BRIDGE IS IN BALANCE AT THE TUNING FREQUENCIES OF THE RESPECTIVE BAND. EACH LOWER FREQUENCY RESONANT CIRCUIT IS CONNECTED TO THE TAP OF THE NEXT HIGHER FREQUENCY RESONANT CIRCUIT.
Inventors
- 👤 Walter Putzer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 05:39
CPC Classifications
H; H03; H03J; H03J3/00; H03J3/02; H03J3/16; H03J3/18; H03J3/185; H03J5/00; H03J5/24; H03J5/242; H03J5/244
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-02-15 | 1974-08-17 | 1975-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-15 | 1978-08-17 | 1979-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-15 | 1982-08-17 | 1983-02-16 | $7700.00 | Window Closed / Lapsed |