US5568112A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for reducing the strength of pulsating magnetic fields
Assignee: Individual
•
Filing: 1993-08-20
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Granted: 1996-10-22
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Expires: 2013-08-20
Abstract
Abstract An apparatus and a method for reducing VLF pulsating magnetic field generated by electronic devices to less than about 0.25 mG beyond about 20 inches from said device. The apparatus includes a closed inert circuit having a number of windings effective to accomplish the reduction.
Inventors
- 👤 Jorge Cure
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 22:03
CPC Classifications
G; G06; G06F; G06F1/00; G06F1/16; G06F1/1601; H; H01; H01J; H01J29/00; H01J29/003; G06F2200/00; G06F2200/16; G06F2200/161; G06F2200/1611; H01J2229/00; H01J2229/0007; H01J2229/0015; H01J2229/0023; H04; H04N; H04N5/00; H04N5/64
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
52 words
In combination with a cathode ray tube device enclosed in a housing, an apparatus for reducing stray pulsating magnetic fields, comprising a system of electrically insulated conducting loop circuits contained within an enclosing form, said enclosing form being disposed externally and in proximity with the housing of said cathode ray tube device.
Claim 2
Dependent Claim
52 words
In combination with a cathode ray tube device enclosed in a housing, an apparatus for reducing stray pulsating magnetic fields, comprising a system of electrically insulated conducting loop circuits contained within an enclosing form, said enclosing form being disposed externally and in proximity with the housing of said cathode ray tube device.
Claim 3
Dependent Claim
26 words
An apparatus as recited in claim 1, wherein said enclosing form has attachment means for affixing said system in proximity to said cathode ray tube device.
Claim 4
Dependent Claim
23 words
An apparatus as recited in claim 1, wherein said enclosing form is an encapsulating structure, said encapsulating structure formed by conventional molding means.
Claim 5
Dependent Claim
16 words
An apparatus as recited in claim 1, wherein said enclosing form is of a frame geometry.
Claim 6
Dependent Claim
16 words
An apparatus as recited in claim 1, wherein said enclosing form is of a plate geometry.
Claim 7
Dependent Claim
100 words
In combination with a cathode ray tube device enclosed in a housing, an apparatus for reducing stray pulsating magnetic fields, comprising a system of electrically insulated conducting loop circuits disposed externally and in proximity with the housing of said cathode ray tube device, wherein said system of electrically insulated conducting loop circuits is a set of separate electrically insulated conducting loop subassemblies, each said subassembly containing said conducting loop circuits within an enclosing form, said subassemblies placed in different locations external to said cathode ray tube device to improve attenuation of stray magnetic fields from said cathode ray tube device.
Claim 8
Dependent Claim
100 words
In combination with a cathode ray tube device enclosed in a housing, an apparatus for reducing stray pulsating magnetic fields, comprising a system of electrically insulated conducting loop circuits disposed externally and in proximity with the housing of said cathode ray tube device, wherein said system of electrically insulated conducting loop circuits is a set of separate electrically insulated conducting loop subassemblies, each said subassembly containing said conducting loop circuits within an enclosing form, said subassemblies placed in different locations external to said cathode ray tube device to improve attenuation of stray magnetic fields from said cathode ray tube device.
Claim 9
Dependent Claim
24 words
An apparatus as recited in claim 6, wherein each said electrically insulated conducting loop subassembly contains a group of separate parallel closed loop circuits.
Claim 10
Dependent Claim
19 words
An apparatus as recited in claim 7, wherein said separate parallel closed loop circuits further comprise closed loop conductors.
Claim 11
Dependent Claim
38 words
An apparatus as recited in claim 6, wherein each said electrically insulated conducting loop subassembly contains a coil having a multiplicity of turns, the ends of said coil electrically connected together so as to form a closed circuit.
Claim 12
Dependent Claim
45 words
An apparatus as recited in claim 6, wherein each said electrically insulated conduction loop subassembly contains closed loop circuits taken from the group of topologies consisting of (a) a multiplicity of parallel distinct closed loop circuits and (b) a coil having ends electrically connected together.
Claim 13
Dependent Claim
35 words
An apparatus as recited in claim 6, wherein each said electrically insulated conducting loop subassembly preferentially affects the attenuation of a specific frequency band of stray magnetic fields emanated from said cathode ray tube device.
Claim 14
Dependent Claim
26 words
An apparatus as recited in claim 6, wherein said conduction loop circuits of said electrically insulated conducting loop subassembly are made electrically resonant at specific frequencies.
Claim 15
Dependent Claim
49 words
An apparatus as recited in claim 12, wherein said conducting loop circuits of said electrically insulated conducting loop subassembly are made electrically resonant at specific frequencies by use of series capacitors placed in said conducting loop circuits so as to resonate with the inductance of said conducting loop circuits.
Claim 16
Dependent Claim
119 words
An apparatus as recited in claim 6, wherein said system of electrically insulated conducting loop circuits comprises two said subassemblies, having largely planar geometries, with a first said subassembly placed immediately adjacent and beneath said cathode ray tube device with the plane of said conducting loop circuit contained therein parallel to the horizontal dimension of said cathode ray tube device, and with a second said subassembly in the form of a rectangularly-shaped planar loop having a first side placed adjacently below and parallel to the lower leading edge of said cathode ray tube device and the second side which is parallel to said first side, placed above and behind the upper leading edge of said cathode ray tube device.
Claim 17
Dependent Claim
32 words
An apparatus as recited in claim 14, wherein said second subassembly has affixing means for placement of said subassembly in proximity and in fixed spatial relationship to said cathode ray tube device.
Claim 18
Independent Claim
104 words
A method of reducing stray pulsating magnetic fields generated by a cathode ray tube device enclosed in a housing, said method comprising the steps of: a) forming a system of electrically insulated conducting loop circuit subassemblies, each said electrically insulated conducting loop circuit subassembly comprising a minimum of one conducting loop within an enclosing housing; and b) placing said electrically insulated conducting loop circuit subassemblies in positions external and proximate to the housing of said cathode ray tube device so as to reduce stray pulsating magnetic fields generated by said cathode ray tube device without opening the housing of said cathode ray tube device.
Claim 19
Independent Claim
104 words
A method of reducing stray pulsating magnetic fields generated by a cathode ray tube device enclosed in a housing, said method comprising the steps of: a) forming a system of electrically insulated conducting loop circuit subassemblies, each said electrically insulated conducting loop circuit subassembly comprising a minimum of one conducting loop within an enclosing housing; and b) placing said electrically insulated conducting loop circuit subassemblies in positions external and proximate to the housing of said cathode ray tube device so as to reduce stray pulsating magnetic fields generated by said cathode ray tube device without opening the housing of said cathode ray tube device.
Claim 20
Dependent Claim
24 words
A method as recited in claim 16, wherein said conducting loop circuits are placed in different locations external to said cathode ray tube device.
Claim 21
Dependent Claim
118 words
A method as recited in claim 17, wherein said system of electrically insulated conducting loop circuits comprises two said subassemblies, having largely planar geometries, with one said subassembly placed immediately adjacent and beneath said cathode ray tube device with the plane of said conducting loop circuit contained therein parallel to the horizontal dimension of said cathode ray tube device, and with a second said subassembly in the form of a rectangularly-shaped planar loop having a first side placed adjacently below and parallel to the lower leading edge of said cathode ray tube device and the second side which is parallel to said first side, placed above and behind the upper leading edge of said cathode ray tube device.
Claim 22
Dependent Claim
37 words
A method as recited in claim 16, wherein said conducting loop circuits are electrically resonant, said resonant loops providing improved reduction of said stray pulsating magnetic fields external to said cathode ray tube device at specific frequencies.
References Cited (Backward Citations)
US4634930A
Cited
US4891468A
Cited
US4931625A
Cited
US4992624A
Cited
US5350973A
Cited
US5107179A
Cited
US5400088A
Cited
US5191307A
Cited
US5355107A
Cited
US5473221A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-10-22 | 2000-04-22 | 2000-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-10-22 | 2004-04-22 | 2004-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-10-22 | 2008-04-22 | 2008-10-22 | $7700.00 | Window Closed / Lapsed |