Patent US3744216A successfully refreshed from Google Patents.
US3744216A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air purifier
Assignee: Environmental Technology Corp
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Filing: 1970-08-07
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Granted: 1973-07-10
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Expires: 1990-08-07
Abstract
Abstract An air purifier is provided for purifying air in rooms of a home, office, or other commercial establishment. Air is filtered by a mechanical filter, then odors are removed from the air, and the air is exposed to germicidal lamps for killing bacteria, then the air passes through a high efficiency electrostatically enhanced filter, and then it is returned to the room by blowers.
Inventors
- 👤 J Halloran
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:42
CPC Classifications
A; A61; A61L; A61L9/00; A61L9/16; A61L9/22; A61L9/18; A61L9/20; B; B01; B01D; B01D50/00; B03; B03C; B03C3/00; B03C3/02; B03C3/04; B03C3/14; B03C3/155; F; F24; F24F; F24F8/00; F24F8/20; F24F8/22; F24F8/80
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
131 words
An air purifier comprising a housing containing an inlet and an outlet, blower means for causing air to flow through the housing from the inlet to the outlet, two filter means in series in said housing between said inlet and outlet for filtering the air flowing between the inlet and outlet, one of said filter means being a pleated member, means defining a low voltage electrostatic field in said housing for causing particles to travel in a zig-zag path through the filter member, said lastmentioned means including spaced electrode plates coupled to a power supply, said filter member being disposed between said plates, an odor oxidizing means including an air-permeable substrate, and an ultraviolet lamp means for sequentially treating air at a location in the housing between said two filter means.
Claim 2
Dependent Claim
131 words
An air purifier comprising a housing containing an inlet and an outlet, blower means for causing air to flow through the housing from the inlet to the outlet, two filter means in series in said housing between said inlet and outlet for filtering the air flowing between the inlet and outlet, one of said filter means being a pleated member, means defining a low voltage electrostatic field in said housing for causing particles to travel in a zig-zag path through the filter member, said lastmentioned means including spaced electrode plates coupled to a power supply, said filter member being disposed between said plates, an odor oxidizing means including an air-permeable substrate, and an ultraviolet lamp means for sequentially treating air at a location in the housing between said two filter means.
Claim 3
Dependent Claim
27 words
An air purifier in accordance with claim 1 including a pair of oppositely disposed germicidal lamps facing towards each other and positioned between said two filter means.
Claim 4
Dependent Claim
128 words
An air purifier comprising a housing containing an inlet and an outlet, blower means for causing air to flow through the housing from the inlet to the outlet, two filter means in series in said housing between said inlet and outlet for filtering the air flowing between the inlet and outlet, one of said filter means being a pleated member, means defining a low voltage electrostatic field in said housing for causing particles to travel in a zig-zag path through the filter member, said last-mentioned means including spaced electrode plates coupled to a power supply, said filter member being disposed between said plates, an odor oxiDizing means having a substrate connected to a source of an oxidizing agent, and said substrate being disposed between said two filter means.
Claim 5
Dependent Claim
128 words
An air purifier comprising a housing containing an inlet and an outlet, blower means for causing air to flow through the housing from the inlet to the outlet, two filter means in series in said housing between said inlet and outlet for filtering the air flowing between the inlet and outlet, one of said filter means being a pleated member, means defining a low voltage electrostatic field in said housing for causing particles to travel in a zig-zag path through the filter member, said last-mentioned means including spaced electrode plates coupled to a power supply, said filter member being disposed between said plates, an odor oxiDizing means having a substrate connected to a source of an oxidizing agent, and said substrate being disposed between said two filter means.
Claim 6
Dependent Claim
32 words
An air purifier in accordance with claim 3 wherein said housing includes a chamber, a container for an oxidizing agent within said chamber, and wick means connecting said substrate to said container.
Claim 7
Dependent Claim
128 words
An air purifier comprising a housing containing an inlet and an outlet, blower means for causing air to flow through the housing from the inlet to the outlet, two filter means in series in said housing between said inlet and outlet for filtering the air flowing between the inlet and outlet, one of said filter means being a pleated member, means defining a low voltage electrostatic field in said housing for causing particles to travel in a zig-zag path through the filter member, said last-mentioned means including spaced electrode plates coupled to a power supply, said filter member being disposed between said plates, said last-mentioned means including a rectifier multi-vibrator circuit for producing a square wave signal at said spaced electroplates between which said filter member is disposed.
Claim 8
Dependent Claim
128 words
An air purifier comprising a housing containing an inlet and an outlet, blower means for causing air to flow through the housing from the inlet to the outlet, two filter means in series in said housing between said inlet and outlet for filtering the air flowing between the inlet and outlet, one of said filter means being a pleated member, means defining a low voltage electrostatic field in said housing for causing particles to travel in a zig-zag path through the filter member, said last-mentioned means including spaced electrode plates coupled to a power supply, said filter member being disposed between said plates, said last-mentioned means including a rectifier multi-vibrator circuit for producing a square wave signal at said spaced electroplates between which said filter member is disposed.
Claim 9
Dependent Claim
29 words
An air purifier in accordance with claim 5 wherein said circuit is an AC circuit with a square wave signal frequency of about 4 to 20 cycles per second.
Claim 10
Dependent Claim
147 words
An air purifier comprising a housing containing an inlet and an outlet, blower means for causing air to flow through the housing from the inlet to the outlet, filter means in series in said housing between said inlet and outlet for filtering the air flowing between the inlet and outlet, one of said filter means being a pleated filter member, means defining a low voltage electrostatic field in said housing for causing particles to travel in a zig-zag path through the pleated filter member, said last-mentioned means including spaced electrode plates coupled to a power supply, said pleated filter member being disposed between said plates, oxidizing means upstream from said one filter means for chemically oxidizing odors, said odor oxidizing means including a substrate through which air can flow, a source of an oxidizing agent, and wick means connecting said substrate to said source of oxidizing agent.
Claim 11
Dependent Claim
147 words
An air purifier comprising a housing containing an inlet and an outlet, blower means for causing air to flow through the housing from the inlet to the outlet, filter means in series in said housing between said inlet and outlet for filtering the air flowing between the inlet and outlet, one of said filter means being a pleated filter member, means defining a low voltage electrostatic field in said housing for causing particles to travel in a zig-zag path through the pleated filter member, said last-mentioned means including spaced electrode plates coupled to a power supply, said pleated filter member being disposed between said plates, oxidizing means upstream from said one filter means for chemically oxidizing odors, said odor oxidizing means including a substrate through which air can flow, a source of an oxidizing agent, and wick means connecting said substrate to said source of oxidizing agent.
Claim 12
Dependent Claim
56 words
An air purifier in accordance with claim 7 wherein said power supply includes a rectifier multi-vibrator circuit for producing a square wave signal at spaced electrode plates between said pleated filter member is disposed, said circuit being an AC circuit, and the square wave signal having a frequency of about 4 to 20 cycles per second.
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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) | 1976-07-09 | 1977-01-08 | 1977-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-09 | 1981-01-08 | 1981-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-09 | 1985-01-08 | 1985-07-10 | $7700.00 | Window Closed / Lapsed |