Patent US3723884A successfully refreshed from Google Patents.
US3723884A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Modular filters for television receivers
Assignee: Individual
•
Filing: 1971-01-05
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Granted: 1973-03-27
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Expires: 1991-01-05
Abstract
Abstract A modular filter for separate attachment to receivers between the tuner and the intermediate frequency stages comprising a compact housing containing passive electronic components connected in circuit with input and output connectors to provide electromagnetic wave filtering at variably selected frequencies.
Inventors
- 👤 W Asplin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:48
CPC Classifications
H; H03; H03H; H03H7/00; H03H7/01; H03H7/0153; H03H7/0161; H03H7/17; H03H7/1741; H03H7/175; H03H7/1791
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
135 words
A modular filter attachment for cable television for mounting in a conventional television receiver between the tuner and the intermediate frequency stages comprising a housing member, input and output connectors mounted on said housing member, a plurality of passive components, at least some of which are variable in value to permit resonant tuning, mounted within said housing and connected between said input and output connectors to provide a plurality of series resonant circuits and at least one parallel resonant circuit to produce electromagnetic wave filtering at desired frequencies, means for connecting the input connector to the output of said tuner, and means for connecting the output connector to the input of said intermediate frequency stages, whereby the conventional television receiver will have greatly improved selectivity and will be adaptable for use in cable television systems.
Claim 2
Dependent Claim
135 words
A modular filter attachment for cable television for mounting in a conventional television receiver between the tuner and the intermediate frequency stages comprising a housing member, input and output connectors mounted on said housing member, a plurality of passive components, at least some of which are variable in value to permit resonant tuning, mounted within said housing and connected between said input and output connectors to provide a plurality of series resonant circuits and at least one parallel resonant circuit to produce electromagnetic wave filtering at desired frequencies, means for connecting the input connector to the output of said tuner, and means for connecting the output connector to the input of said intermediate frequency stages, whereby the conventional television receiver will have greatly improved selectivity and will be adaptable for use in cable television systems.
References Cited (Backward Citations)
US2650265A
Cited
US2901533A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-03-26 | 1976-09-25 | 1977-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-26 | 1980-09-25 | 1981-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-26 | 1984-09-25 | 1985-03-27 | $7700.00 | Window Closed / Lapsed |