US3992173A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air filter and method of making same
Assignee: Korhumel Industries Inc
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Filing: 1975-04-24
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Granted: 1976-11-16
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Expires: 1995-04-24
Abstract
Abstract An air filter of the type having a porous filter medium body layer supported in a complementary unitary frame has a perforated panel supportingly engaging one face of the layer with folded up narrow panels along the edges of the layer, narrow retainer panels overlying the margins of the opposite face of the layer from the perforated panel, and each of the retainer panels being provided with spaced extensions which overlap adjacent the corners of the layer and are secured together as by means of adhesive, there also being anchoring adhesive securing two of the retainer panels to the filter layer. The overlapping extensions are perforated. An efficient method of making the air filter is provided.
Inventors
- 👤 Charles E. Wharton
- 👤 Clarence Bell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:08
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/0002; B01D46/0016; B01D46/10; Y; Y10; Y10S; Y10S55/00; Y10S55/05; Y10S55/31; Y10T; Y10T156/00; Y10T156/10; Y10T156/1002; Y10T156/1034; Y10T156/1043; Y10T156/1049; Y10T156/1051
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
218 words
An air filter having a porous filter medium body layer of substantial thickness, said filter layer having a plurality of angularly related edges defining corner areas of the layer, said layer being supported in a complementary unitary frame folded up from a single blank of sheet material, the frame comprising: perforated main panel supportingly engaging one face of said filter layer and having boundaries substantially coextensive with the edges of the filter medium layer; a respective folded up narrow edge panel of substantially the same width as the thickness of the filter layer being joined on a fold line along each boundary of said main panel, and each of said edge panels being disposed in face-to-face contiguous relation to the edge of the filter layer nearest to it; a narrow respective retainer panel joined along a fold line to the distal end of each of said edge panels, and said retainer panels overlying said filter layer; each of said retainer panels having a central cutout providing a substantial gap such that at the opposite sides of the gap the retainer panel has respective coplanar flange extensions; said flange extensions of contiguous retainer panels being in overlapping relation to one another over said corner areas of the filter layer; and means securing said overlapping flange extensions to one another.
Claim 2
Dependent Claim
218 words
An air filter having a porous filter medium body layer of substantial thickness, said filter layer having a plurality of angularly related edges defining corner areas of the layer, said layer being supported in a complementary unitary frame folded up from a single blank of sheet material, the frame comprising: perforated main panel supportingly engaging one face of said filter layer and having boundaries substantially coextensive with the edges of the filter medium layer; a respective folded up narrow edge panel of substantially the same width as the thickness of the filter layer being joined on a fold line along each boundary of said main panel, and each of said edge panels being disposed in face-to-face contiguous relation to the edge of the filter layer nearest to it; a narrow respective retainer panel joined along a fold line to the distal end of each of said edge panels, and said retainer panels overlying said filter layer; each of said retainer panels having a central cutout providing a substantial gap such that at the opposite sides of the gap the retainer panel has respective coplanar flange extensions; said flange extensions of contiguous retainer panels being in overlapping relation to one another over said corner areas of the filter layer; and means securing said overlapping flange extensions to one another.
Claim 3
Dependent Claim
37 words
A filter according to claim 1, wherein said gaps are of generally V-form and are spaced from the outer sides of the flange extensions, the maximum width of the flange extensions being adjacent to said outer sides.
Claim 4
Dependent Claim
84 words
A filter according to claim 1, wherein certain of the overlapping flange extensions lie between the filter layer and others of the flange extensions, and further including flap flanges connected along outer sides of said certain flange extensions, said flap flanges being of a width substantially equal to the width of said edge panels and folded down between the contiguous edge of the filter layer and the adjacent edge panel and with the distal ends of the flap flanges contiguous to said main panel.
Claim 5
Dependent Claim
17 words
A filter according to claim 1, including means securing overlapping portions of the retainer to one another.
Claim 6
Dependent Claim
33 words
A filter according to claim 4, wherein said means securing said overlapping flange extensions to one another and said means securing said overlapping portions of the retainer panels comprise respective stripes of adhesive.
Claim 7
Dependent Claim
31 words
A filter according to claim 5, wherein said stripes of adhesive are substantially spaced apart, and said flange extensions have air holes of substantial area therethrough located between said adhesive strips.
Claim 8
Dependent Claim
14 words
A filter according to claim 1, wherein said flange extensions have air holes therethrough.
Claim 9
Dependent Claim
43 words
A filter according to claim 7, wherein said flange extensions have portions thereof which are in overlapping relation and remaining portions which are free from overlap, said overlapping portions having matching air holes in registration, said remaining portions having additional air holes therethrough.
Claim 10
Dependent Claim
27 words
A filter according to claim 1, wherein certain of said retainer panels have stripes of adhesive therealong bonding the filter body layer to said certain retainer panels.
Claim 11
Dependent Claim
22 words
A filter according to claim 9, wherein said stripes of adhesive also bond overlapping portions of the retainer panels to one another.
Claim 12
Dependent Claim
44 words
An air filter according to claim 1, wherein some of the overlapping flange extensions are superimposed on other of the overlapping flange extensions and the superimposed flange extensions have slanted edges extending inwardly toward the gap of the retainer panels having the slanted edges.
Claim 13
Independent Claim
220 words
A method of making an air filter, comprising: bringing together a porous filter medium body layer of substantial thickness and having a plurality of angularly related edges defining corner areas of the filter layer, and a complementary supporting unitary frame adapted to be folded up from a single blank of sheet material, including placing one face of the layer in supporting engagement with a perforated main panel of said frame having boundaries substantially coextensive with the edges of the filter medium layer; folding up into contiguous relation to the respective edges of the filter layer narrow edge panels of substantially the same width as the thicknessof the filter layer and joined on a fold line along each boundary of said main panel; folding a narrow respective panel joined along a fold line to the distal end of each of said edge panels into overlying relation to said filter layer; each of said retainer panels having a central cutout providing a substantial gap such that at the opposite sides of the gap the retainer panel has respective coplanar flange extensions; overlapping said coplanar flange areas of the filter layer; and flange extensions of contiguous retainer panels to each other and over said corners said areas each other and over said corner said areas securing said overlapping flange extensions to one anther.
Claim 14
Independent Claim
220 words
A method of making an air filter, comprising: bringing together a porous filter medium body layer of substantial thickness and having a plurality of angularly related edges defining corner areas of the filter layer, and a complementary supporting unitary frame adapted to be folded up from a single blank of sheet material, including placing one face of the layer in supporting engagement with a perforated main panel of said frame having boundaries substantially coextensive with the edges of the filter medium layer; folding up into contiguous relation to the respective edges of the filter layer narrow edge panels of substantially the same width as the thicknessof the filter layer and joined on a fold line along each boundary of said main panel; folding a narrow respective panel joined along a fold line to the distal end of each of said edge panels into overlying relation to said filter layer; each of said retainer panels having a central cutout providing a substantial gap such that at the opposite sides of the gap the retainer panel has respective coplanar flange extensions; overlapping said coplanar flange areas of the filter layer; and flange extensions of contiguous retainer panels to each other and over said corners said areas each other and over said corner said areas securing said overlapping flange extensions to one anther.
Claim 15
Dependent Claim
60 words
A method according to claim 12, wherein said flange extensions have a flap flanges and said method includes folding said flap flanges along outer sides of certain of the flange extensions into position between the contiguous edge of the filter layer and the adjacent edge panel, and positioning the distal ends of the flap flanges contiguous to said main panel.
Claim 16
Dependent Claim
20 words
A method according to claim 12, comprising effecting said securing by supplying said overlapping flange extensions with stripes of adhesive.
Claim 17
Dependent Claim
37 words
A method according to claim 14, wherein said flange extensions have air holes of substantial area and said method further comprises applying said stripes of adhesive substantially spaced apart and at opposite sides of said air holes.
Claim 18
Dependent Claim
17 words
A method according to claim 12, comprising placing in registration matching air holes in said flange extensions.
Claim 19
Dependent Claim
39 words
A method according to claim 12, including applying stripes of adhesive along certain faces of the retainer panels and pressing the faces against the filter body layer and thereby adhesively bonding the filter layer to said certain retainer panels.
Claim 20
Dependent Claim
45 words
A method according to claim 17, wherein portions of adjacent retainer panels overlap and said method further comprises applying said stripes of adhesive also on the overlapping portions of the retainer panels and thereby bonding such overlapping portions of the retainer panels to one another.
Claim 21
Dependent Claim
57 words
A method according to claim 12, comprising, before folding up said edge panels and folding said retainer panels, effecting relative movement of the filter body layer and said blank of sheet material as an assembly relative to adhesive stripe applying nozzles and thereby applying stripes of adhesive along certain of said retainer panels and their flange extensions.
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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) | 1979-11-16 | 1980-05-17 | 1980-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-11-16 | 1984-05-17 | 1984-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-11-16 | 1988-05-17 | 1988-11-16 | $7700.00 | Window Closed / Lapsed |