US4615804A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High density pleat spacing and scoring tool and filter made therewith
Assignee: Donaldson Co Inc
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Filing: 1984-08-30
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Granted: 1986-10-07
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Expires: 2004-08-30
Abstract
Abstract A spacing and scoring tool for creating high density pleated filter media, and the media therefor is disclosed herein. A blade (14) having curvilinear portions (22, 22a) and linear portions (21, 21a) create an island pattern when scored into flat or corrugated media (16). The island are preferably located centrally upon the corrugation peaks (18) either at every peak or periodically. The resulting pattern when foled produces filter media with automatic pleat spacing and this structure can be used at very high pleat spacings beyond 10 pleats per inch. The blade (14) is solid on its contact face at the curvilinear portions for preventing island collapse when the media is folded.
Inventors
- 👤 Mervin E. Wright
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 12:27
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/52; B01D46/521; B01D46/523; B01D29/00; B01D29/01; B01D29/012; B01D29/05; B01D29/07; B01D29/11; B01D29/111; B01D29/13; B01D29/15; B01D29/21; B01D46/0001; B01D46/10; B01D46/24; B01D46/2403; B01D46/2411; B01D2201/00; B01D2201/12; B01D2201/127; Y; Y10; Y10S; Y10S493/00; Y10S493/941
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
139 words
A pleated filter assembly comprising: a corrugated filter media having longitudinally extending corrugations cooperating to define a plurality of parallel alternating peaks and valleys spaced apart by a predetermined spacing; a pattern scored into said media with said pattern including a pleat fold line extending normal to said peaks and valleys; said pattern further including a plurality of flats disposed along said pleat fold line with said flats having a first dimension normal to said line and greater than a thickness of said line; said flats disposed along said line with each of said flats disposed upon a peak of a corrugation of said filter media; and each of said flats having a second dimension normal to said corrugations and less than a distance between valleys on opposite sides of a corrugation peak on which said flat is disposed.
Claim 2
Dependent Claim
139 words
A pleated filter assembly comprising: a corrugated filter media having longitudinally extending corrugations cooperating to define a plurality of parallel alternating peaks and valleys spaced apart by a predetermined spacing; a pattern scored into said media with said pattern including a pleat fold line extending normal to said peaks and valleys; said pattern further including a plurality of flats disposed along said pleat fold line with said flats having a first dimension normal to said line and greater than a thickness of said line; said flats disposed along said line with each of said flats disposed upon a peak of a corrugation of said filter media; and each of said flats having a second dimension normal to said corrugations and less than a distance between valleys on opposite sides of a corrugation peak on which said flat is disposed.
Claim 3
Dependent Claim
94 words
A pleated filter assembly according to claim 1 comprising: a second pattern scored into said media including a second pleat fold line extending normal to said peaks and valleys; said second pattern including a second plurality of flats disposed along said second pleat fold line with said flats of said second plurality having first dimensions normal to said line and greater than a thickness of said line; said flats disposed along said second line with each of said flats of said second plurality disposed upon a valley of a corrugation of said filter media.
Claim 4
Dependent Claim
47 words
A pleated filter assembly according to claim 2 wherein said flats of said second plurality have a second dimension normal to said corrugations and less than a distance between peaks on opposite sides of a corrugation peak on which said flat of said second plurality is disposed.
Claim 5
Dependent Claim
18 words
A pleated filter assembly according to claim 1 wherein successive flats are disposed on peaks of successive corrugations.
Claim 6
Dependent Claim
25 words
A pleated filter assembly according to claim 1 wherein said flats are oval in shape and have a center disposed on peaks of said corrugations.
Claim 7
Dependent Claim
25 words
A pleated filter assembly according to claim 1 wherein said flats are circular in shape and have a center disposed on peaks of said corrugations.
Claim 8
Dependent Claim
37 words
A pleated filter assembly according to claim 1 wherein said filter media is provided with a plurality of said patterns to present a plurality of opposing pleat tips with a plurality of abutting flats at said tips.
References Cited (Backward Citations)
US2298980A
Cited
US2395449A
Cited
US2936855A
Cited
US3112184A
Cited
US3198336A
Cited
US3174625A
Cited
US3392843A
Cited
US3531920A
Cited
US3950256A
Cited
SU637687A2
Cited
DE2729207A1
Cited
US4268290A
Cited
US4452619A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-10-06 | 1990-04-07 | 1990-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-10-06 | 1994-04-07 | 1994-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-10-06 | 1998-04-07 | 1998-10-07 | $7700.00 | Window Closed / Lapsed |