US3742259A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electronic band-pass filter or oscillator
Assignee: Duracell Inc USA
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Filing: 1972-01-20
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Granted: 1973-06-26
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Expires: 1992-01-20
Abstract
Abstract The disclosure is directed to an electronic band-pass filter having improved characteristics including high band-pass selectivity and a highly amplified output signal. The circuitry used in the filter system is particularly amenable to hybrid and/or monolythic integration, without the need for large external L-C components commonly found in present electronic filters. In the integrated form, the filter is easily adjusted for both selected frequency (fo) and gain and Q (figure of merit).
Inventors
- 👤 R Donald
- 👤 W Spofford
- 👤 D Pomerantz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 21:37
CPC Classifications
H; H03; H03H; H03H11/00; H03H11/02; H03H11/04; H03H11/12; H03H11/126
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
102 words
A n electronic band-pass filter for selectively passing signals having a predetermined frequency comprising: a. summing means for summing signals having an input for receiving signals to be filtered, said summing means having an output and one other input. b. a phase shifting means comprising a drift field transistor comprising a doped semiconductor material having conductor terminals attached thereto and including emitter and collector junctions and biasing resistors threfore, and a variable vottage supply means between said conductor terminals, and c. amplifying means having an input connected to said collector, and an output connected to said other input of said summing means.
Claim 2
Dependent Claim
102 words
A n electronic band-pass filter for selectively passing signals having a predetermined frequency comprising: a. summing means for summing signals having an input for receiving signals to be filtered, said summing means having an output and one other input. b. a phase shifting means comprising a drift field transistor comprising a doped semiconductor material having conductor terminals attached thereto and including emitter and collector junctions and biasing resistors threfore, and a variable vottage supply means between said conductor terminals, and c. amplifying means having an input connected to said collector, and an output connected to said other input of said summing means.
Claim 3
Dependent Claim
18 words
The electronic band-pass filter according to claim 1 wherein: said summing means is operated in the addition mode.
Claim 4
Dependent Claim
18 words
The electronic band-pass filter according to claim 1 wherein: said summing means is operated in the subtraction mode.
Claim 5
Dependent Claim
55 words
The electronic band-pass filter according to claim 3 wherein: said drift field transistor is integrated and has a time delay period which is variable in accordance with the (1) geometrical distance between its emitter and collector, and (2) the value of the voltage supplied to or between the end terminals of said drift field transistor.
Claim 6
Dependent Claim
54 words
The electronic band-pass filter according to claim 1 wherein: the electronic band-pass filter is comprised of several electronic band-pass filters substantially like that described in claim 1, said filters being connected in series so as to provide an output characteristic having improved frequency selectivity at the output of the last one of said filters.
References Cited (Backward Citations)
US3175158A
Cited
US3427559A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-06-25 | 1976-12-25 | 1977-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-25 | 1980-12-25 | 1981-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-25 | 1984-12-25 | 1985-06-26 | $7700.00 | Window Closed / Lapsed |