US3789589A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High performance filter assembly
Assignee: Research Products Corp
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Filing: 1973-02-28
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Granted: 1974-02-05
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Expires: 1993-02-28
Abstract
Abstract A high performance filter assembly includes an outer casing adapted for insertion in the ductwork or plenum of an air treating system. A drawer is removably secured within the casing and contains an improved pleated filter media of the high efficiency type. The upstream portion of the drawer is sealed to the casing by a cam arrangement, and double blankets are disposed at the drawer ends and casing ends to further prevent air leakage. The pleated filter itself is collapsible for easy storage, and expands to a fixed position when installed. Reinforcements on the outermost walls of the pleated filter prevent possible tearing of the filter during its installation and also support said walls during filter expansion. The elongated filter edges are sealed to the drawer by a member which also functions to secure a plurality of filter-supporting fingers.
Inventors
- 👤 J Delany
- 👤 J Liebmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:18
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/52; B01D46/521; B01D46/0002; B01D46/0005; B01D46/0006; B01D46/10; B01D2271/00; B01D2271/02
Claims Analysis
Total Claims: 51
Claim 1
Independent Claim
167 words
A high performance filter assembly for connection to a duct of an air treating system wherein air flows from upstream to downstream, said assembly comprising, in combination: a. a generally rectangular casing for mounting to the said duct, said casing being open on its upstream and downstream portions as well as on its front end, b. a generally rectangular drawer disposed within said casing and adapted for sliding insertion and removal through said casing''s open front end, said drawer being open on its upstream and downstream portion as well as on at least its front end portion, c. a high efficiency filter body disposed in said drawer for filtering air passing through the assembly from the upstream to the downstream portions thereof, said filter body being pleated and expandible from side to side of said drawer and having front and rear end edges, d. closure means for said open ends of said casing and drawer, e. and means to prevent leakage of unfiltered air through said assembly.
Claim 2
Dependent Claim
167 words
A high performance filter assembly for connection to a duct of an air treating system wherein air flows from upstream to downstream, said assembly comprising, in combination: a. a generally rectangular casing for mounting to the said duct, said casing being open on its upstream and downstream portions as well as on its front end, b. a generally rectangular drawer disposed within said casing and adapted for sliding insertion and removal through said casing''s open front end, said drawer being open on its upstream and downstream portion as well as on at least its front end portion, c. a high efficiency filter body disposed in said drawer for filtering air passing through the assembly from the upstream to the downstream portions thereof, said filter body being pleated and expandible from side to side of said drawer and having front and rear end edges, d. closure means for said open ends of said casing and drawer, e. and means to prevent leakage of unfiltered air through said assembly.
Claim 3
Dependent Claim
17 words
and a cap-like door removably secured to each of said drawer''s front and rear open end portions.
Claim 4
Dependent Claim
17 words
and a cap-like door removably secured to each of said drawer''s front and rear open end portions.
Claim 5
Dependent Claim
11 words
a peripheral gasket disposed on at least one of said flanges,
Claim 6
Dependent Claim
11 words
a peripheral gasket disposed on at least one of said flanges,
Claim 7
Dependent Claim
37 words
the end edges of said filter body being embedded into said blankets, c. and third sealing means to prevent by-passing of unfiltered air between the respective ends of said drawer and casing, said third sealing means comprising:
Claim 8
Dependent Claim
37 words
the end edges of said filter body being embedded into said blankets, c. and third sealing means to prevent by-passing of unfiltered air between the respective ends of said drawer and casing, said third sealing means comprising:
Claim 9
Dependent Claim
41 words
and a second planular blanket of resilient filter material disposed within said front casing cover and with the front end of said drawer embedded thereinto, d. all of said blankets having a greater resistance to air flow than said filter body.
Claim 10
Dependent Claim
41 words
and a second planular blanket of resilient filter material disposed within said front casing cover and with the front end of said drawer embedded thereinto, d. all of said blankets having a greater resistance to air flow than said filter body.
Claim 11
Dependent Claim
79 words
The filter assembly of claim 1 wherein said leakage preventing means ocmprises: a. first sealing means to seal the upstream portions of said drawer and casing together when said drawer is in its innermost position, b. second sealing means to prevent by-passing of unfiltered air around the front and rear end edges of said filter body within said drawer, c. and third sealing means to prevent by-passing of unfiltered air between the respective ends of said drawer and casing.
Claim 12
Dependent Claim
20 words
a pair of elongated flanges extending downstream from said retainer with the innermost flange being narrower than the outermost flange,
Claim 13
Dependent Claim
20 words
a pair of elongated flanges extending downstream from said retainer with the innermost flange being narrower than the outermost flange,
Claim 14
Dependent Claim
12 words
and a pair of spaced downstream extending outer and inner elongated flanges,
Claim 15
Dependent Claim
12 words
and a pair of spaced downstream extending outer and inner elongated flanges,
Claim 16
Dependent Claim
8 words
and a transverse lug on each said extension,
Claim 17
Dependent Claim
8 words
and a transverse lug on each said extension,
Claim 18
Dependent Claim
20 words
said outer flange having a generally rectangular slot which receives a said extension so that said cam-like member is stabilized,
Claim 19
Dependent Claim
20 words
said outer flange having a generally rectangular slot which receives a said extension so that said cam-like member is stabilized,
Claim 20
Dependent Claim
24 words
each said lug having an indented groove on its inner upstream surface portion; b. and wherein each said combined closing and supporting means comprises:
Claim 21
Dependent Claim
24 words
each said lug having an indented groove on its inner upstream surface portion; b. and wherein each said combined closing and supporting means comprises:
Claim 22
Dependent Claim
16 words
first slot means disposed in said innermost flange and receiving the end of said inner rod,
Claim 23
Dependent Claim
16 words
first slot means disposed in said innermost flange and receiving the end of said inner rod,
Claim 24
Dependent Claim
104 words
The filter assembly of claim 1 in which said leakage preventing means includes sealing means to seal the upstream portions of said drawer and casing together when said drawer is in its innermost position, said sealing means comprising: a. generally co-extensive inwardly extending peripheral flanges on the upstream portion of said casing and said drawer, b. a peripheral gasket disposed on at least one of said flanges, c. and cooperative camming means between said casing and said drawer to cause said drawer to shift upstream only at the innermost portion of rearward sliding travel of said drawer to seal said flanges and gasket together.
Claim 25
Dependent Claim
65 words
and cooperative camming means between said casing and said drawer to cause said drawer to shift upstream only at the innermost portion of rearward sliding travel of said drawer to seal said flanges and gasket together, b. second sealing means to prevent by-passing of unfiltered air around the front and rear end edges of said filter body within said drawer, said second sealing means comprising:
Claim 26
Dependent Claim
65 words
and cooperative camming means between said casing and said drawer to cause said drawer to shift upstream only at the innermost portion of rearward sliding travel of said drawer to seal said flanges and gasket together, b. second sealing means to prevent by-passing of unfiltered air around the front and rear end edges of said filter body within said drawer, said second sealing means comprising:
Claim 27
Dependent Claim
84 words
The filter assembly of claim 3 in which said cooperative camming means comprises: a. front and rear transversely extending support members disposed respectively adjacent the open front end of said casing and the rear end thereof, said support members being disposed in the downstream portion, b. and downstream facing cam means disposed on the front and rear end portions of said drawer with said cam means being disposed to ride onto said support members when said drawer reaches its innermost portion of sliding travel.
Claim 28
Dependent Claim
27 words
said inner flange being inclined toward said outer flange so that said lug snaps into the space between said flanges whereby said inner flange engages said groove.
Claim 29
Dependent Claim
27 words
said inner flange being inclined toward said outer flange so that said lug snaps into the space between said flanges whereby said inner flange engages said groove.
Claim 30
Dependent Claim
21 words
and second slot means disposed in said outermost flange and receiving the end of said outer rod by a snap fit.
Claim 31
Dependent Claim
21 words
and second slot means disposed in said outermost flange and receiving the end of said outer rod by a snap fit.
Claim 32
Dependent Claim
24 words
the central portion of said second slot means being enlarged to receive the said outermost rod in the installed position of said comb-like member.
Claim 33
Dependent Claim
24 words
the central portion of said second slot means being enlarged to receive the said outermost rod in the installed position of said comb-like member.
Claim 34
Dependent Claim
36 words
The filter assembly of claim 4 in which said downstream facing cam means comprises: a. projection means on the inner drawer end, b. and a bevelled surface on the edge of the said front drawer door.
Claim 35
Dependent Claim
27 words
The filter assembly of claim 1: a. in which said drawer is open on both its front and rear end portions, b. and said closure means comprises:
Claim 36
Dependent Claim
40 words
The filter assembly of claim 6 wherein said leakage preventing means comprises: a. first sealing means to seal the upstream portions of said drawer and casing together when said drawer is in its innermost position, said first sealing means comprising:
Claim 37
Dependent Claim
67 words
The filter assembly of claim 6 in which said leakage preventing means includes sealing means to prevent by-passing of unfiltered air around the front and rear end edges of said filter body, said sealing means comprising: a. a planular blanket of resilient material disposed within both said cap-like drawer doors and extending inwardly therefrom, b. the end edges of said filter body being embedded into said blankets.
Claim 38
Dependent Claim
25 words
The filter assembly of claim 8 in which said blankets are of filter material having a greater resistance to air flow than said filter body.
Claim 39
Dependent Claim
85 words
The filter assembly of claim 1 in which said leakage preventing means includes sealing means to prevent by-passing of unfiltered air between the respective ends of said drawer and casing, said sealing means comprising: a. a first planular blanket of resilient material disposed at the rear end of said casing and with the rear end of said drawer embedded thereinto, b. and a second planular blanket of resilient material disposed within said front casing cover and with the front end of said drawer embedded thereinto.
Claim 40
Dependent Claim
25 words
The filteR assembly of claim 10 in which said blankets are of filter material having a greater resistance to air flow than said filter body.
Claim 41
Dependent Claim
94 words
The filter assembly of claim 1: a. wherein said pleated filter body is self supporting and, when expanded, forms a plurality of equally spaced downstream facing generally V-shaped pockets, b. which includes a plurality of elongated comb-like members with said members having a plurality of fingers corresponding in spacing to said V-shaped pockets of the expanded filter body, c. and means disposed on said filter body to limit the expansion thereof during installation of said body in said drawer so that the entrances to said pockets will coincide with the positions of said fingers.
Claim 42
Dependent Claim
51 words
The filter assembly of claim 12 in which said expansion limiting means comprises a narrow flexible strip of flimsy non self-supporting material extending transversely across each downstream side of said filter body and secured to the latter so that a plurality of its said pockets, when fully expanded, are equally spaced.
Claim 43
Dependent Claim
37 words
The filter assembly of claim 12 which includes: means to support each said comb-like member so that the fingers thereof are disposed within said pockets for supporting the pocket walls against collapse due to the air pressure.
Claim 44
Dependent Claim
53 words
The filter assembly of claim 1: a. wherein said pleated filter body forms a plurality of spaced upstream and downstream facing generally V-shaped pockets, b. and which includes means disposed within each outermost downstream facing filter body pocket to support the outermost wall of said filter body pocket during expansion of said body.
Claim 45
Dependent Claim
30 words
The filter assembly of claim 15 wherein each said wall supporting means comprises a reinforcing tongue secured to each end portion of the outermost wall of said filter body pocket.
Claim 46
Dependent Claim
57 words
The filter assembly of claim 15 wheein each said wall supporting means comprises a frame-like element having: a. a reinforcing strip disposed along the downstream edge portion of each outermost wall of said filter body, b. and a tongue extending upstream from each end portion of said strip within the said outermost downstream facing filter body pocket.
Claim 47
Dependent Claim
88 words
The filter assembly of claim 1 which includes: a. a pair of oppositely disposed elongated downstream extending lips disposed on said drawer, b. a shallow upstream facing envelope-like pocket formed in the downstream edge portion of each outermost filter body pleat wall, c. each said pocket being supportingly disposed over the respective lip, d. a frame-like element disposed to support each said outermost filter body pleat wall during expansion of said body, e. and means to secure the ends of said envelope-like pocket and said frame-like element together.
Claim 48
Dependent Claim
66 words
The filter assembly of claim 1 which includes: a. a pair of oppositely disposed downstream extending elongated lips disposed on said drawer, b. a shallow upstream facing envelope-like pocket formed in the downstream edge portion of each outermost filter body pleat wall, c. each said pocket being supportingly disposed over the respective lip, d. and means to sealingly close each said pocket onto its respective lip.
Claim 49
Dependent Claim
79 words
The filter assembly of claim 19: a. wherein said pleated filter body forms a plurality of spaced downstream facing generally V-shaped pockets, b. which includes a plurality of elongated comb-like members with each member having a plurality of spaced fingers disposed within said V-shaped pockets for supporting the pocket walls against collapse due to the air pressure differential within the assembly, c. and wherein said closing means for said envelope-like pockets also forms means for supporting said comb-like members.
Claim 50
Dependent Claim
14 words
The filter assembly of claim 20: a. in which each said comb-like member includes:
Claim 51
Dependent Claim
54 words
The filter assembly of claim 20: a. in which each said comb-like member includes a pair of spaced inner and outer parallel rods disposed along the base of said fingers, and with the outer rod being longer than the adjacent inwardly disposed rod, b. and wherein each said combined closing and supporting means comprises:
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) | 1977-02-04 | 1977-08-06 | 1978-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-04 | 1981-08-06 | 1982-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-04 | 1985-08-06 | 1986-02-05 | $7700.00 | Window Closed / Lapsed |