US3849314A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filter media inserts
Assignee: Marvel Engineering Co
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Filing: 1973-06-21
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Granted: 1974-11-19
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Expires: 1993-06-21
Abstract
Abstract A cylindrical filter member is formed from a pleated filter element. Each wall of the pleated filter element has integral projections, with the projections of adjacent walls contacting each other to provide uniform spacing.
Inventors
- 👤 F Niccum
- 👤 P Heinrich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:17
CPC Classifications
B; B01; B01D; B01D29/00; B01D29/11; B01D29/13; B01D29/15; B01D29/21
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
198 words
A cylindrical filter member formed by a pleated filter element having a series of spaced pleat walls, and means integral with each wall of said pleated filter element for maintaining uniform pleat spacing including projections extending from opposite sides of each pleat wall, adjacent pleat wall projections extending from opposite sides of each pleat wall, projections from opposing walls being in contact with one another, each of said pleat wall projections having a length substantially greater than its width, with contacting pleat wall projections forming an angle on the order of about 90* with each other, inner and outer folds adjoining adjacent pleat walls, with the spacing between walls joined by an outer fold being substantially constant over the radial length of the wall, contacting projections between pleat walls joined by an outer fold having generally constant depth and width throughout the length thereof, the spacing between pleat walls joined by an inner fold gradually increasing from the inner fold toward the outside of the filter, with the depth and width of contacting projections spacing pleat walls joined by an inner fold gradually increasing from the inside of the filter element toward the outside of the filter element.
Claim 2
Dependent Claim
198 words
A cylindrical filter member formed by a pleated filter element having a series of spaced pleat walls, and means integral with each wall of said pleated filter element for maintaining uniform pleat spacing including projections extending from opposite sides of each pleat wall, adjacent pleat wall projections extending from opposite sides of each pleat wall, projections from opposing walls being in contact with one another, each of said pleat wall projections having a length substantially greater than its width, with contacting pleat wall projections forming an angle on the order of about 90* with each other, inner and outer folds adjoining adjacent pleat walls, with the spacing between walls joined by an outer fold being substantially constant over the radial length of the wall, contacting projections between pleat walls joined by an outer fold having generally constant depth and width throughout the length thereof, the spacing between pleat walls joined by an inner fold gradually increasing from the inner fold toward the outside of the filter, with the depth and width of contacting projections spacing pleat walls joined by an inner fold gradually increasing from the inside of the filter element toward the outside of the filter element.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-11-18 | 1978-05-20 | 1978-11-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-18 | 1982-05-20 | 1982-11-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-18 | 1986-05-20 | 1986-11-19 | $7700.00 | Window Closed / Lapsed |