Patent US5704953A successfully refreshed from Google Patents.
US5704953A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Forced air system air filter
Assignee: Air Kontrol Inc
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Filing: 1996-03-29
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Granted: 1998-01-06
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Expires: 2016-03-29
Abstract
Abstract An HVAC filter having a pleated paper filter and a plastic pre-filter, the filter and pre-filter are mounted in a parallel relation in the frame. The plastic pre-filter includes a plastic mesh having a plurality of openings, and an irregular surface on the inlet side to prevent matting of filtered material.
Inventors
- 👤 Michael J. Stemmer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:49
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/52; B01D46/521; B01D46/10; B01D46/523; B01D46/56; B01D46/62; B01D2267/00; B01D2267/40; Y; Y10; Y10S; Y10S55/00; Y10S55/39
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
46 words
An air filter comprising: a frame; a pleated filter element supported by the frame; and a substantially planar pre-filter formed from woven plastic strands and supported by the frame in a side-by-side relationship with the pleated filter to filter air which passes through the pleated filter.
Claim 2
Dependent Claim
46 words
An air filter comprising: a frame; a pleated filter element supported by the frame; and a substantially planar pre-filter formed from woven plastic strands and supported by the frame in a side-by-side relationship with the pleated filter to filter air which passes through the pleated filter.
Claim 3
Dependent Claim
13 words
The filter of claim 1, wherein the pleated filter is formed from paper.
Claim 4
Dependent Claim
11 words
The filter of claim 2, wherein the paper includes fiberglass fibers.
Claim 5
Dependent Claim
23 words
The filter of claim 1, wherein the plastic strands have different diameters and are woven such that the pre-filter has an irregular surface.
Claim 6
Dependent Claim
11 words
The filter of claim 4, wherein the plastic strands are polypropylene.
Claim 7
Dependent Claim
21 words
The filter of claim 1, wherein the frame is rectangular, and is fabricated from elongated sections having a generally U-shaped cross-section.
Claim 8
Dependent Claim
21 words
The filter of claim 1, wherein the frame is rectangular, and is fabricated from elongated sections having a generally U-shaped cross-section.
Claim 9
Dependent Claim
42 words
An air filter comprising: a frame; a pleated filter element supported by the frame; and a substantially planar woven, plastic mesh supported by the frame in a side-by-side relationship with the pleated filter to filter air which passes through the pleated filter.
Claim 10
Dependent Claim
42 words
An air filter comprising: a frame; a pleated filter element supported by the frame; and a substantially planar woven, plastic mesh supported by the frame in a side-by-side relationship with the pleated filter to filter air which passes through the pleated filter.
Claim 11
Dependent Claim
13 words
The filter of claim 8, wherein the pleated filter is formed from paper.
Claim 12
Dependent Claim
11 words
The filter of claim 9, wherein the paper includes fiberglass fibers.
Claim 13
Dependent Claim
26 words
The filter of claim 9, wherein plastic mesh includes plastic strands having different diameters and are woven such that the plastic mesh has an irregular surface.
Claim 14
Dependent Claim
11 words
The filter of claim 11, wherein the plastic strands are polypropylene.
Claim 15
Dependent Claim
21 words
The filter of claim 9, wherein the frame is rectangular, and is fabricated from elongated sections having a generally U-shaped cross-section.
Claim 16
Dependent Claim
80 words
An air handling unit defining a path of airflow, the unit comprising: a filter support; and a filter assembly supported by the support within the path of airflow through the air handling unit, the filter assembly comprising; a frame; a pleated filter element supported by the frame, and. a substantially planar plastic pre-filter formed from woven plastic strands and supported by the frame in a side-by-side relationship with the pleated filter to filter air which passes through the pleated filter.
Claim 17
Dependent Claim
80 words
An air handling unit defining a path of airflow, the unit comprising: a filter support; and a filter assembly supported by the support within the path of airflow through the air handling unit, the filter assembly comprising; a frame; a pleated filter element supported by the frame, and. a substantially planar plastic pre-filter formed from woven plastic strands and supported by the frame in a side-by-side relationship with the pleated filter to filter air which passes through the pleated filter.
Claim 18
Dependent Claim
13 words
The filter of claim 14, wherein the pleated filter is formed from paper.
Claim 19
Dependent Claim
23 words
The filter of claim 14, wherein the plastic strands have different diameters and are woven such that the pre-filter has an irregular surface.
Claim 20
Dependent Claim
58 words
An air filter comprising: a frame; a pleated filter element supported by the frame; and a plastic pre-filter formed from plastic strands supported by the frame in a side-by-side relationship with the pleated filter to filter air which passes through the pleated filter, wherein the plastic strands have different diameters such that the pre-filter has an irregular surface.
Claim 21
Dependent Claim
58 words
An air filter comprising: a frame; a pleated filter element supported by the frame; and a plastic pre-filter formed from plastic strands supported by the frame in a side-by-side relationship with the pleated filter to filter air which passes through the pleated filter, wherein the plastic strands have different diameters such that the pre-filter has an irregular surface.
Claim 22
Dependent Claim
11 words
The filter of claim 17 wherein the plastic strands are polypropylene.
Claim 23
Dependent Claim
11 words
The filter of claim 17 wherein the plastic strands are woven.
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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) | 2001-01-05 | 2001-07-07 | 2002-01-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-01-05 | 2005-07-07 | 2006-01-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-01-05 | 2009-07-07 | 2010-01-06 | $7700.00 | Window Closed / Lapsed |