US3750370A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air purifier
Assignee: Proto Manufacturing Ltd
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Filing: 1971-12-09
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Granted: 1973-08-07
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Expires: 1991-12-09
Abstract
Abstract This air purifier consists of a rectangular unit having two opposite grills in its walls through which the air in a room enters and leaves. The Air entering the unit passes through one of the grills which is equipped with a filter containing activated carbon, and before it is discharged through the opposite grill, it is exposed to the action of ultraviolet light. The air is sucked into and forced out of the unit by means of an electrically motorized fan located inside of the unit.
Inventors
- 👤 E Brauss
- 👤 A Dercho
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:12
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/10; B01D46/12
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
84 words
A domestic air purifying unit comprising an enclosed rectangular container with a removable cover, having an air intake grill in one of its walls and an air discharge grill in its opposite wall, the said intake grill being provided with a filtering and deodorizing medium, and germicidal means; and means for bypassing the said filtering medium when it is plugged; in combination with an electrically motorized fan, ultraviolet light source, an electrical transformer, and an on and off switch, located within the said container.
Claim 2
Dependent Claim
84 words
A domestic air purifying unit comprising an enclosed rectangular container with a removable cover, having an air intake grill in one of its walls and an air discharge grill in its opposite wall, the said intake grill being provided with a filtering and deodorizing medium, and germicidal means; and means for bypassing the said filtering medium when it is plugged; in combination with an electrically motorized fan, ultraviolet light source, an electrical transformer, and an on and off switch, located within the said container.
Claim 3
Dependent Claim
196 words
A domestic air purifying unit comprising an enclosed rectangular container which is provided with a removable cover, the said container consisting of a base and two walls, and the said cover having a top and two walls located oppositely to the walls of the container; an air intake grill located in the rear wall of the said container and an air discharge grill located in the front wall of the said container; said intake grill being provided with a filter made up of two layers of fine porous material and a layer of activated carbon between them; in combination with an electrically motorized fan rotating clockwise in a horizontal plane and housed within a rectangular enclosure having an opening directly above the said fan, said fan enclosure being directly connected to the said air discharge grill and contained within the said container; an electric motor to operate the said fan; a plurality of ultraviolet lights located within the said container for germicidal purposes; a transformer for reducing the power source to the required voltage; an on and off switch; and a baffle plate located between the fan and the discharge grill centrally located on that grill.
Claim 4
Dependent Claim
196 words
A domestic air purifying unit comprising an enclosed rectangular container which is provided with a removable cover, the said container consisting of a base and two walls, and the said cover having a top and two walls located oppositely to the walls of the container; an air intake grill located in the rear wall of the said container and an air discharge grill located in the front wall of the said container; said intake grill being provided with a filter made up of two layers of fine porous material and a layer of activated carbon between them; in combination with an electrically motorized fan rotating clockwise in a horizontal plane and housed within a rectangular enclosure having an opening directly above the said fan, said fan enclosure being directly connected to the said air discharge grill and contained within the said container; an electric motor to operate the said fan; a plurality of ultraviolet lights located within the said container for germicidal purposes; a transformer for reducing the power source to the required voltage; an on and off switch; and a baffle plate located between the fan and the discharge grill centrally located on that grill.
Claim 5
Dependent Claim
32 words
An air purifying unit such as described in claim 2, which is provided with an air filter at the air discharge grill similar to the air filter at the air intake grill.
References Cited (Backward Citations)
FR529210A
Cited
US2638644A
Cited
US2945554A
Cited
US3072978A
Cited
US3071828A
Cited
US3685258A
Cited
US3654534A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-06 | 1977-02-05 | 1977-08-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-06 | 1981-02-05 | 1981-08-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-06 | 1985-02-05 | 1985-08-07 | $7700.00 | Window Closed / Lapsed |