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US3841840A Expired / Lapsed US ⏱️ 0.0 years remaining

Electrostatic filter

Assignee: Individual
•
Filing: 1972-07-27
•
Granted: 1974-10-15
•
Expires: 1992-07-27
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Abstract

Abstract An electrostatic filter for use in an air-cleaning appliance suitable for residential as well as industrial premises has electrodes separated by a substance which permanently adsorbs or absorbs the particles carried by the air, or converts them into innocuous compounds by a chemical transformation or reaction, so as to prevent the particles from being returned to the ambient air when the appliance is switched off. The substance may, for example, be one having a large surface area, such as activated carbon, kieselguhr zoltile, gels or the like, or an oxidizing or reducing agent, e.g., potassium permanganate or sodium persulphate, and may be applied in the form of a surface layer either to at least one of the electrodes or to a spacer element therebetween. To optimize the effectiveness of the substance, auxiliary heating may be provided if necessary. The spacer element, if provided, may be corrugated or folded so as to increase its surface area, the air passing along the corrugations or folds.

Inventors

  • 👤 C Cobarg
  • 👤 H Boehm
  • 👤 E Hundhausen

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-28 18:45
CPC Classifications
B; B03; B03C; B03C3/00; B03C3/02; B03C3/04; B03C3/14; B03C3/155

Claims Analysis

Total Claims: 9
Claim 1
Independent Claim 82 words
AN ELECTROSTATIC FILTER COMPRISING: A. PAIR OF SPACED-APART ELECTRODES WITH CONFRONTING FACES ENERGIZED WITH OPPOSITE POLARITY; CIRCULATION MEANS FOR DRIVING A FLOW OF AIR TO BE PURIFIED THROUGH THE SPACE BETWEEN SAID ELECTRODES; AND A FOIL-SHAPED INSERT DISPOSED BETWEEN SAID ELECTRODES WITH MAJOR SURFACES PARALLEL TO THE DIRECTION OF SAID FLOW, SAID MAJOR SURFACES DEFINING WITH SAID CONFRONTING FACES A PLURALITY OF SUBSTANTIALLY UNOBSTRUCTED PARALLEL CHANNELS, SAID INSERT BEING LADEN WITH A PURIFYING AGENT EXPOSED TO THE AIR ALONG SAID MAJOR SURFACES:
Claim 2
Dependent Claim 82 words
AN ELECTROSTATIC FILTER COMPRISING: A. PAIR OF SPACED-APART ELECTRODES WITH CONFRONTING FACES ENERGIZED WITH OPPOSITE POLARITY; CIRCULATION MEANS FOR DRIVING A FLOW OF AIR TO BE PURIFIED THROUGH THE SPACE BETWEEN SAID ELECTRODES; AND A FOIL-SHAPED INSERT DISPOSED BETWEEN SAID ELECTRODES WITH MAJOR SURFACES PARALLEL TO THE DIRECTION OF SAID FLOW, SAID MAJOR SURFACES DEFINING WITH SAID CONFRONTING FACES A PLURALITY OF SUBSTANTIALLY UNOBSTRUCTED PARALLEL CHANNELS, SAID INSERT BEING LADEN WITH A PURIFYING AGENT EXPOSED TO THE AIR ALONG SAID MAJOR SURFACES:
Claim 3
Dependent Claim 28 words
An electrostatic filter as defined in claim 1 wherein said insert is disposed with clearance between said electrodes, said major surfaces lying substantially parallel to said confronting faces.
Claim 4
Dependent Claim 26 words
An electrostatic filter as defined in claim 1 wherein said insert is an undulating strip of sheet material with fold lines paralleling said direction of flow.
Claim 5
Dependent Claim 19 words
An electrostatic filTer as defined in claim 3 wherein said strip contacts said confronting faces along said fold lines.
Claim 6
Dependent Claim 30 words
An electrostatic filter as defined in claim 4 wherein said electrodes and said insert are convoluted into a substantially cylindrical cartridge with an axis parallel to said direction of flow.
Claim 7
Dependent Claim 31 words
An electrostatic filter comprising a plurality of substantially cylindrical cartridges as defined in claim 5, a common housing for said cartridges and circulation means common to said cartridges in said housing.
Claim 8
Dependent Claim 51 words
An electrostatic filter as defined in claim 6 wherein said housing is substantially cylindrical and open at both ends of the cylinder, said cartridges being clustered in said housing with their axes parallel to the housing axis, said circulation means comprising an axially oriented fan disposed near one of said ends.
Claim 9
Dependent Claim 23 words
An electrostatic filter as defined in claim 7, further comprising a charging grid interposed in said housing between said fan and said cartridges.

References Cited (Backward Citations)

US1964794A Cited
US2974747A Cited
DE1212703B Cited
US3665679A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1977-10-14 1978-04-15 1978-10-15 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1981-10-14 1982-04-15 1982-10-15 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1985-10-14 1986-04-15 1986-10-15 $7700.00 Window Closed / Lapsed

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