US5405434A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrostatic particle filtration
Assignee: Scott Fetzer Co
•
Filing: 1993-09-22
•
Granted: 1995-04-11
•
Expires: 2013-09-22
Abstract
Abstract An on board electrostatic filter for a vacuum cleaner is disclosed. The filter includes a pair of conductive filaments insulated from one another and disposed close together in a substantially parallel, side-by-side relationship. Circuitry is provided for applying an electrical potential difference between the two conductors. This dual filament conductor is preferably packed into a relatively small volume in a tortuous configuration, to form a random mesh, or can be oriented in a more regular serpentine configuration. Other embodiments describe the mesh electrostatic filter to purify air in an HVAC system.
Inventors
- 👤 Ion I. Inculet
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 18:43
CPC Classifications
A; A47; A47L; A47L9/00; A47L9/10; A47L9/14; A47L13/00; A47L13/10; A47L13/40; A47L9/12; B; B03; B03C; B03C3/00; B03C3/02; B03C3/04; B03C3/14; B03C3/155; Y; Y10; Y10S; Y10S323/00; Y10S323/903
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
105 words
A filter comprising: a) electrically conductive filaments, said filaments being electrically insulated from one another at least in part by a layer of solid flexible non-porous electrically insulating material borne about the circumference of each filament; b) circuitry for applying an electrical potential difference in the range of 0.5 volts to 500 volts between said filaments to create an electrical field sufficiently strong to attract dust particles for capture on said filaments, and c) said filaments being arranged to form a mesh wherein the insulation of an insulated filament of one electrical potential substantially touches the insulation of an insulated filament of another electrical potential.
Claim 2
Dependent Claim
105 words
A filter comprising: a) electrically conductive filaments, said filaments being electrically insulated from one another at least in part by a layer of solid flexible non-porous electrically insulating material borne about the circumference of each filament; b) circuitry for applying an electrical potential difference in the range of 0.5 volts to 500 volts between said filaments to create an electrical field sufficiently strong to attract dust particles for capture on said filaments, and c) said filaments being arranged to form a mesh wherein the insulation of an insulated filament of one electrical potential substantially touches the insulation of an insulated filament of another electrical potential.
Claim 3
Dependent Claim
18 words
The filter of claim 1, further comprising: means for reversing the polarity of said applied electrical potential difference.
Claim 4
Dependent Claim
14 words
The filter of claim 1, wherein: said conductive filaments have a non-circular cross section.
Claim 5
Dependent Claim
13 words
The filter of claim 3, wherein said filaments have a triangular cross section.
Claim 6
Dependent Claim
14 words
The filter of claim 3, wherein said conductive filaments have a square cross section.
Claim 7
Dependent Claim
14 words
The filter of claim 3, wherein said conductive filaments have an oblong cross section.
Claim 8
Dependent Claim
92 words
A filter comprising: a) electrically conductive filaments, said filaments being electrically insulated from one another at least in part by dual layer flexible non-porous polyamide insulation about the circumference of each filament; b) circuitry for applying an electrical potential difference between said filaments to create an electrical field sufficiently strong to attract dust particles for capture on said filaments, and c) said filaments being arranged to form a mesh wherein the insulation of an insulated filament of one electrical potential substantially touches the insulation of an insulated filament of another electrical potential.
Claim 9
Dependent Claim
92 words
A filter comprising: a) electrically conductive filaments, said filaments being electrically insulated from one another at least in part by dual layer flexible non-porous polyamide insulation about the circumference of each filament; b) circuitry for applying an electrical potential difference between said filaments to create an electrical field sufficiently strong to attract dust particles for capture on said filaments, and c) said filaments being arranged to form a mesh wherein the insulation of an insulated filament of one electrical potential substantially touches the insulation of an insulated filament of another electrical potential.
Claim 10
Dependent Claim
20 words
The filter of claim 7, wherein: said electrically conductive filaments comprise copper wire having a diameter of approximately 0.04 inches.
Claim 11
Dependent Claim
19 words
The filter of claim 7, wherein said electrical potential is in the range of 0.5 volts to 500 volts.
Claim 12
Dependent Claim
15 words
The filter of claim 9, wherein said electrical potential difference is greater than 500 volts.
Claim 13
Dependent Claim
102 words
A filter comprising: a) electrically conductive filaments, said filaments being electrically insulated from one another by a substantially uniformly thick layer of solid electrically insulating material borne about the circumference of each filament; b) circuitry for applying an electrical potential difference in the range of 0.5 volts to 500 volts between said filaments to create an electrical field sufficiently strong to attract dust particles for capture on said filaments, and c) said filaments being arranged to form a mesh wherein the insulation of an insulated filament of one electrical potential substantially touches the insulation of an insulated filament of another electrical potential.
Claim 14
Dependent Claim
102 words
A filter comprising: a) electrically conductive filaments, said filaments being electrically insulated from one another by a substantially uniformly thick layer of solid electrically insulating material borne about the circumference of each filament; b) circuitry for applying an electrical potential difference in the range of 0.5 volts to 500 volts between said filaments to create an electrical field sufficiently strong to attract dust particles for capture on said filaments, and c) said filaments being arranged to form a mesh wherein the insulation of an insulated filament of one electrical potential substantially touches the insulation of an insulated filament of another electrical potential.
Claim 15
Dependent Claim
119 words
A filter comprising: a) electrically conductive filaments, said filaments being electrically insulated from one another at least in part by a layer of solid flexible electrically insulating material borne about the circumference of each filament, said filaments being separated by a distance of less than the diameter of a filament; b) circuitry for applying an electrical potential difference in the range of 0.5 volts to 500 volts between said filaments to create an electrical field sufficiently strong to attract dust particles for capture on said filaments; and c) said filaments being arranged to form a mesh wherein the insulation of an insulated filament of one electrical potential substantially touches the insulation of an insulated filament of another electrical potential.
Claim 16
Dependent Claim
119 words
A filter comprising: a) electrically conductive filaments, said filaments being electrically insulated from one another at least in part by a layer of solid flexible electrically insulating material borne about the circumference of each filament, said filaments being separated by a distance of less than the diameter of a filament; b) circuitry for applying an electrical potential difference in the range of 0.5 volts to 500 volts between said filaments to create an electrical field sufficiently strong to attract dust particles for capture on said filaments; and c) said filaments being arranged to form a mesh wherein the insulation of an insulated filament of one electrical potential substantially touches the insulation of an insulated filament of another electrical potential.
References Cited (Backward Citations)
CA821900A
Cited
US1059253A
Cited
GB334210A
Cited
US2080242A
Cited
DE894154C
Cited
GB881975A
Cited
GB1025064A
Cited
US3334370A
Cited
GB1094832A
Cited
US3355562A
Cited
GB1154604A
Cited
US3590412A
Cited
US3592639A
Cited
US3597789A
Cited
US3724174A
Cited
FR2115827A5
Cited
GB1379738A
Cited
US3930815A
Cited
DE2166206A1
Cited
US3739552A
Cited
US4058936A
Cited
GB1501927A
Cited
GB1535635A
Cited
US4155727A
Cited
US4225086A
Cited
US4185972A
Cited
US4282626A
Cited
US4198061A
Cited
US4213224A
Cited
GB2029259A
Cited
GB2033248A
Cited
GB2108377A
Cited
US4665581A
Cited
US4715078A
Cited
GB2131320A
Cited
US4588537A
Cited
SU1212584A1
Cited
US4652282A
Cited
US4626263A
Cited
EP0207203A2
Cited
EP0345828A2
Cited
US4702752A
Cited
US4662903A
Cited
US4697300A
Cited
US4785492A
Cited
US4715085A
Cited
US4715086A
Cited
EP0332282A2
Cited
US4980796A
Cited
EP0443254A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-04-10 | 1998-10-10 | 1999-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-04-10 | 2002-10-10 | 2003-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-04-10 | 2006-10-10 | 2007-04-11 | $7700.00 | Window Closed / Lapsed |