US3696592A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tapered separator for pleated filter
Assignee: Allis Chalmers Corp
•
Filing: 1971-05-20
•
Granted: 1972-10-10
•
Expires: 1991-05-20
Abstract
Abstract A tapered separator for a pleated filter formed from a blank of foldable sheet material having one portion folded in zigzag formation to present first fold increments of a first selected height and the remaining portion folded in zigzag fashion to present second fold increments in substantially end-to-end relation with said first fold increments and of a second selected height different from the height of said first fold increments to thereby provide a tapered configuration to the separator.
Inventors
- 👤 Donald E Engleman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:48
CPC Classifications
F; F04; F04B; F04B1/00; F04B1/12; F04B1/122; F04B1/124; F04B1/126; B; B01; B01D; B01D27/00; B01D27/04; B01D27/06; B01D29/00; B01D29/01; B01D29/012; B01D29/016; B01D46/00; B01D46/10; B01D46/52; B01D46/521; B01D46/523; B31; B31F; B31F1/00; B31F1/20; B31F1/24; B31F1/26; B01D2201/00; B01D2201/12
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
182 words
A filter apparatus comprising a flow-through housing: a sheet of filter material disposed within said housing in sealed relation with the sides of said housing and folded back and forth upon itself to provide a plurality of pleats extending across said housing and, a plurality of tapered separators each disposed within a said pleat, said separators each including a blank of foldable sheet material having a first portion thereof folded in a zigzag formation to provide a plurality of first folds extending perpendicularly to said pleats and being uniformly of a first selected height; said blank having the remainiNg downstream portion thereof folded in pre-selected zigzag formation to provide a plurality of second folds extending perpendicularly to said pleats and being uniformly of a second selected height different from said first height said first and second folds including edges and being separated by a step portion to provide a separator of tapered configuration, the first and second fold edges being parallel to enhance laminar flow within the apparatus and adjacent pleats alternately having the first and second folds as the upstream portion.
Claim 2
Dependent Claim
182 words
A filter apparatus comprising a flow-through housing: a sheet of filter material disposed within said housing in sealed relation with the sides of said housing and folded back and forth upon itself to provide a plurality of pleats extending across said housing and, a plurality of tapered separators each disposed within a said pleat, said separators each including a blank of foldable sheet material having a first portion thereof folded in a zigzag formation to provide a plurality of first folds extending perpendicularly to said pleats and being uniformly of a first selected height; said blank having the remainiNg downstream portion thereof folded in pre-selected zigzag formation to provide a plurality of second folds extending perpendicularly to said pleats and being uniformly of a second selected height different from said first height said first and second folds including edges and being separated by a step portion to provide a separator of tapered configuration, the first and second fold edges being parallel to enhance laminar flow within the apparatus and adjacent pleats alternately having the first and second folds as the upstream portion.
Claim 3
Dependent Claim
29 words
The apparatus of claim 1, said fold increments of one portion of said blank being an even multiple of the fold increments of the other portion of said blank.
References Cited (Backward Citations)
US3293833A
Cited
US3242656A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-10-10 | 1976-04-10 | 1976-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-10 | 1980-04-10 | 1980-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-10 | 1984-04-10 | 1984-10-10 | $7700.00 | Window Closed / Lapsed |