Patent US4210067A successfully refreshed from Google Patents.
US4210067A
Expired / Lapsed
US
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Method of and apparatus for making air filters
Assignee: DUST STOP Corp
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Filing: 1978-10-02
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Granted: 1980-07-01
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Expires: 1998-10-02
Abstract
Abstract Generally rectangular paperboard frame blanks are fed separately into a horizontal position from a stack at one end of a first leg portion of an L-shaped assembly line, and air filter mats are fed respectively to the frame blanks. Each edge portion of a frame blank is scored to provide three spaced parallel fold lines. As each frame blank with an air filter mat is conveyed along the assembly line, glue is applied along two spaced parallel glue lines on each of a first pair of opposite edge portions and the edge portions are doubly folded. Then the blank and mat are shifted at right angles and conveyed along the second leg portion of the L-shaped assembly line where the gluing and folding operations are repeated for the second pair of opposite edge portions.
Inventors
- 👤 Alton Evans, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:23
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/10; B01D46/12; Y; Y10; Y10S; Y10S493/00; Y10S493/941; Y10S55/00; Y10S55/05; Y10S55/31
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
356 words
Apparatus for making air filters from paperboard filter frame blanks and air filter mats comprising first upper and lower endless belt conveyor means for successively gripping blanks with mats respectively thereon and moving them horizontally in a first direction, first folding and gluing means on each of a pair of transversely opposite sides of the first upper and lower endless belt conveyor means for upwardly doubly folding each of a first pair of opposite edge portions of each of the blanks to provide a pair of upper and lower inner folded portions between an upper outer folded portion and the unfolded portion of the blank, for gluing the inner end portion of the lower inner folded portion to the mat on the blank at each of a first pair of opposite edge portions of the mat, and for gluing the outer end portions of the upper outer folded portions of the doubly folded first pair of opposite edge portions of each of the blanks directly to the unfolded portion of the blank respectively adjacent their junctures therewith, second upper and lower endless belt conveyor means for successively gripping blanks with mats received from the first upper and lower endless belt conveyor means and moving them horizontally in a second direction at right angles to the first direction, and second folding and gluing means on each of a pair of transversely opposite sides of the second upper and lower endless belt conveyor means for upwardly doubly folding each of a second pair of opposite edge portions of each of the blanks to provide a pair of upper and lower inner folded portions between an upper outer folded portion and the unfolded portion of the blank, for gluing the inner end portion of the lower inner folded portion to the mat on the blank at each of a second pair of opposite edge portions of the mat, and for gluing the outer end portions of the upper outer folded portions of the doubly folded second pair of opposite edge portions of each of the blanks directly to the unfolded portion of the blank respectively adjacent their junctures therewith.
Claim 2
Dependent Claim
356 words
Apparatus for making air filters from paperboard filter frame blanks and air filter mats comprising first upper and lower endless belt conveyor means for successively gripping blanks with mats respectively thereon and moving them horizontally in a first direction, first folding and gluing means on each of a pair of transversely opposite sides of the first upper and lower endless belt conveyor means for upwardly doubly folding each of a first pair of opposite edge portions of each of the blanks to provide a pair of upper and lower inner folded portions between an upper outer folded portion and the unfolded portion of the blank, for gluing the inner end portion of the lower inner folded portion to the mat on the blank at each of a first pair of opposite edge portions of the mat, and for gluing the outer end portions of the upper outer folded portions of the doubly folded first pair of opposite edge portions of each of the blanks directly to the unfolded portion of the blank respectively adjacent their junctures therewith, second upper and lower endless belt conveyor means for successively gripping blanks with mats received from the first upper and lower endless belt conveyor means and moving them horizontally in a second direction at right angles to the first direction, and second folding and gluing means on each of a pair of transversely opposite sides of the second upper and lower endless belt conveyor means for upwardly doubly folding each of a second pair of opposite edge portions of each of the blanks to provide a pair of upper and lower inner folded portions between an upper outer folded portion and the unfolded portion of the blank, for gluing the inner end portion of the lower inner folded portion to the mat on the blank at each of a second pair of opposite edge portions of the mat, and for gluing the outer end portions of the upper outer folded portions of the doubly folded second pair of opposite edge portions of each of the blanks directly to the unfolded portion of the blank respectively adjacent their junctures therewith.
Claim 3
Independent Claim
220 words
A method of making an air filter comprising placing an air filter mat on a paperboard filter frame blank, doubly folding each of a first pair of opposite edge portions of the blank upwardly to provide a pair of upper and lower inner folded portions between an upper outer folded portion and the unfolded portion of the blank, gluing the inner end portion of the lower inner folded portion to the mat at each of a first pair of opposite edge portions of the mat, gluing the outer end portions of the upper outer folded portions of the doubly folded first pair of opposite edge portions directly to the unfolded portion of the blank respectively adjacent their junctures therewith, doubly folding each of a second pair of opposite edge portions of the blank upwardly to provide a pair of upper and lower inner folded portions between an upper outer folded portion and the unfolded portion of the blank, gluing the inner end portion of the lower inner folded portion to the mat at each of a second pair of opposite edge portions of the mat, and gluing the outer end portions of the upper outer folded portions of the doubly folded second pair of opposite edge portions directly to the unfolded portion of the blank respectively adjacent their junctures therewith.
Claim 4
Independent Claim
220 words
A method of making an air filter comprising placing an air filter mat on a paperboard filter frame blank, doubly folding each of a first pair of opposite edge portions of the blank upwardly to provide a pair of upper and lower inner folded portions between an upper outer folded portion and the unfolded portion of the blank, gluing the inner end portion of the lower inner folded portion to the mat at each of a first pair of opposite edge portions of the mat, gluing the outer end portions of the upper outer folded portions of the doubly folded first pair of opposite edge portions directly to the unfolded portion of the blank respectively adjacent their junctures therewith, doubly folding each of a second pair of opposite edge portions of the blank upwardly to provide a pair of upper and lower inner folded portions between an upper outer folded portion and the unfolded portion of the blank, gluing the inner end portion of the lower inner folded portion to the mat at each of a second pair of opposite edge portions of the mat, and gluing the outer end portions of the upper outer folded portions of the doubly folded second pair of opposite edge portions directly to the unfolded portion of the blank respectively adjacent their junctures therewith.
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) | 1983-07-01 | 1983-12-31 | 1984-07-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-07-01 | 1987-12-31 | 1988-07-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-07-01 | 1991-12-31 | 1992-07-01 | $7700.00 | Window Closed / Lapsed |