Patent US3675402A successfully refreshed from Google Patents.
US3675402A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Adjustable filter assembly
Assignee: Individual
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Filing: 1970-11-20
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Granted: 1972-07-11
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Expires: 1990-11-20
Abstract
Abstract A frame assembly for a filter or the like which is adapted to be inserted in apertures of buildings such as windows or doors or the like. The frame assembly is telescopically adjustable in two different directions for being accommodated by different size and shape apertures, and is provided with an elongate clamp at each telescopically adjustable portion for holding the adjustment and for rigidity and strength. A filtering material is disposed within the frame assembly and is provided with a retaining screen at each of its major surfaces.
Inventors
- 👤 John Howard Weed
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:28
CPC Classifications
F; F24; F24F; F24F13/00; F24F13/28; F24F8/00; F24F8/10; F24F8/108; Y; Y10; Y10S; Y10S55/00; Y10S55/31
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
259 words
An adjustable filter assembly for use in purifying air entering an aperture of a building comprising: a frame assembly comprising first and second cardboard frame members, each of said frame members comprising a first and second leg portion and an intermediary portion interconnecting said leg portion, the leg portions of the first frame member being interfitted with the leg portions of the second frame member to form a telescopically adjustable parallelogram, each of said frame members having a continuous recessed channel along its entire length facing the inner area defined by said parallelogram for receiving a filter material; a sheet of fibrous filter material contained within the confines of the frame assembly and having its edge portions disposed within the channels of the frame members; first and second screens positioned on opposite sides of the fibrous filter material, each of said screens having their edge portions disposed within the channels of the frame members, for preventing billowing of the filter material during use; and a pair of substantially rigid clamps, each comprising a pair of parallel sidewalls connected together by a base portion for frictionally mating with an outer surface of said interfitted leg portions, and wherein the ends of the sidewalls farthest removed from the base portion are turned back and inward in hairpin configuration to frictionally engage an inside surface of the channel at the interconnections, each of said clamps being substantially longer in the direction of the line formed by the intersection of a side wall and the base portion than along its width or height.
Claim 2
Dependent Claim
259 words
An adjustable filter assembly for use in purifying air entering an aperture of a building comprising: a frame assembly comprising first and second cardboard frame members, each of said frame members comprising a first and second leg portion and an intermediary portion interconnecting said leg portion, the leg portions of the first frame member being interfitted with the leg portions of the second frame member to form a telescopically adjustable parallelogram, each of said frame members having a continuous recessed channel along its entire length facing the inner area defined by said parallelogram for receiving a filter material; a sheet of fibrous filter material contained within the confines of the frame assembly and having its edge portions disposed within the channels of the frame members; first and second screens positioned on opposite sides of the fibrous filter material, each of said screens having their edge portions disposed within the channels of the frame members, for preventing billowing of the filter material during use; and a pair of substantially rigid clamps, each comprising a pair of parallel sidewalls connected together by a base portion for frictionally mating with an outer surface of said interfitted leg portions, and wherein the ends of the sidewalls farthest removed from the base portion are turned back and inward in hairpin configuration to frictionally engage an inside surface of the channel at the interconnections, each of said clamps being substantially longer in the direction of the line formed by the intersection of a side wall and the base portion than along its width or height.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-11 | 1976-01-10 | 1976-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-11 | 1980-01-10 | 1980-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-11 | 1984-01-10 | 1984-07-11 | $7700.00 | Window Closed / Lapsed |