Patent US4901043A successfully refreshed from Google Patents.
US4901043A
Expired / Lapsed
US
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Compact filter having a multi-compartment housing
Assignee: TRESNESS (2013) IRREVOCABLE PATENT TRUST
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Filing: 1987-07-02
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Granted: 1990-02-13
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Expires: 2007-07-02
Abstract
Abstract A filter comprises components arranged in a plurality of compartments which are magnetically shielded from each other. Each compartment includes components for filtering two frequencies wherein these frequencies are separated by an amount such that inductive coupling is substantially prevented. The compartments are combined to increase the attenuation, and any number of compartments may be utilized to filter the desired number of frequencies.
Inventors
- 👤 Raymond W. Palinkas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 16:20
CPC Classifications
H; H03; H03H; H03H7/00; H03H7/01; H03H7/17; H03H7/1741; H03H7/1783; H03H7/0115; H03H7/1791
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
121 words
A filter comprising at least two compartments including first and second compartments, means for magnetically isolating said first compartment from said second compartment, first filter means for removing a first frequency range and having cooperating components in each of said first and second compartments, and second filter means for removing a second frequency range and having cooperating components in said first and second compartments, said cooperating components of each of said first and second filter means comprising discrete inductive and capacitive elements, wherein said first frequency range differs from said second frequency range by an amount such that magnetic coupling between said components of said first and second filter means in each of said first and second compartments is substantially prevented.
Claim 2
Dependent Claim
121 words
A filter comprising at least two compartments including first and second compartments, means for magnetically isolating said first compartment from said second compartment, first filter means for removing a first frequency range and having cooperating components in each of said first and second compartments, and second filter means for removing a second frequency range and having cooperating components in said first and second compartments, said cooperating components of each of said first and second filter means comprising discrete inductive and capacitive elements, wherein said first frequency range differs from said second frequency range by an amount such that magnetic coupling between said components of said first and second filter means in each of said first and second compartments is substantially prevented.
Claim 3
Dependent Claim
31 words
A filter according to claim 1 wherein said at least two compartments comprises more than two of said compartments wherein each compartment contains elements for removing more than two frequency ranges.
Claim 4
Dependent Claim
19 words
A filter according to claim 1 wherein each of said first and second filter means is a notch filter.
Claim 5
Dependent Claim
18 words
A filter according to claim 3 wherein each of said first and second compartments comprises a metal casing.
Claim 6
Dependent Claim
20 words
A filter according to claim 3 wherein each of said first and second frequency ranges includes a cable television frequency.
Claim 7
Dependent Claim
19 words
A filter according to claim 3 wherein said components of each of said filters comprise shunt and series circuits.
Claim 8
Dependent Claim
26 words
A filter according to claim 6 wherein said series and shunt circuits in each of said compartments are arranged to inductively couple to provide phase cancellation.
Claim 9
Dependent Claim
20 words
A filter according to claim 1 wherein said first and second compartments contain elements for removing only two frequency ranges.
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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) | 1993-02-12 | 1993-08-14 | 1994-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-02-12 | 1997-08-14 | 1998-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-02-12 | 2001-08-14 | 2002-02-13 | $7700.00 | Window Closed / Lapsed |