Patent US3794938A successfully refreshed from Google Patents.
US3794938A
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Coupled bandstop/bandpass filter
Assignee: GEN AVIAT ELECTRONICS Inc
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Filing: 1971-05-03
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Granted: 1974-02-26
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Expires: 1991-05-03
Abstract
Abstract This disclosure includes a four pole bandstop filter coupled to a five pole bandpass filter tuned to an adjacent band to achieve a very steep attenuation curve between the two bands and an increased bandstop width.
Inventors
- 👤 D Boelter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 17:06
CPC Classifications
H; H03; H03H; H03H7/00; H03H7/01; H03H7/0153; H03H7/0161; H03H7/17; H03H7/1741; H03H7/1758; H03H7/1775
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
108 words
An electrical ladder-type filter which comprises a. a bandstop filter having four series resonant circuits in transverse branches and connected to a common point, and capacitors to couple between pairs of series resonant circuits, and b. a bandpass filter coupled to said bandstop filter and having 5 parallel resonant circuits in transverse branches, said bandpass filter having a capacitor to couple between two of the parallel resonant circuits, said bandstop filter being tuned to a band adjacent to the passband of said bandpass filter, and wherein one of said parallel resonant circuits includes a tapped inductor and the bandstop filter connects to the tap on said tapped inductor.
Claim 2
Dependent Claim
108 words
An electrical ladder-type filter which comprises a. a bandstop filter having four series resonant circuits in transverse branches and connected to a common point, and capacitors to couple between pairs of series resonant circuits, and b. a bandpass filter coupled to said bandstop filter and having 5 parallel resonant circuits in transverse branches, said bandpass filter having a capacitor to couple between two of the parallel resonant circuits, said bandstop filter being tuned to a band adjacent to the passband of said bandpass filter, and wherein one of said parallel resonant circuits includes a tapped inductor and the bandstop filter connects to the tap on said tapped inductor.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-02-25 | 1977-08-27 | 1978-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-25 | 1981-08-27 | 1982-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-25 | 1985-08-27 | 1986-02-26 | $7700.00 | Window Closed / Lapsed |