Patent US4072616A successfully refreshed from Google Patents.
US4072616A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filter cartridge
Assignee: Sintermetallwerk Krebsoege GmbH
•
Filing: 1976-08-10
•
Granted: 1978-02-07
•
Expires: 1996-08-10
Abstract
Abstract A filter cartridge comprises a body of sintered material having a star-shaped profile and a substantially constant wall thickness. The body has a folded or corrugated configuration with the corrugations extending longitudinally parallel to the axis or along a helix or screw-thread pattern. The ribs or corrugations can be symmetrical about axial planes of the body and, in an embodiment of the invention, are parallel thereto.
Inventors
- 👤 Rainer Rohlig
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:00
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/52; B01D46/521; B01D46/522; B01D29/00; B01D29/11; B01D29/31; B01D29/33; B01D29/333; B01D39/00; B01D39/14; B01D39/20; B01D39/2027; B01D39/2031; B01D39/2034; B01D46/24; B01D46/2403; B01D46/2407; B01D2275/00; B01D2275/20; B01D2275/206
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
126 words
A filter cartridge comprising an elongated porous filter body of sintered metal closed at one end and formed with a plurality of folds in a star-like profile and of uniform cross section and constant wall thickness, said folds extending along the length of said body, and a flange formed unitarily with said body of said sintered metal at the other end of said body, the walls of said folds merging into said flange at said other end, in cross section, each of said folds having a pair of walls bridged externally with a connecting portion and wherein proximal walls of successive folds are bridged by further portions, said folds having a mean width approximately equal to three times the thickness of said walls of said folds.
Claim 2
Dependent Claim
126 words
A filter cartridge comprising an elongated porous filter body of sintered metal closed at one end and formed with a plurality of folds in a star-like profile and of uniform cross section and constant wall thickness, said folds extending along the length of said body, and a flange formed unitarily with said body of said sintered metal at the other end of said body, the walls of said folds merging into said flange at said other end, in cross section, each of said folds having a pair of walls bridged externally with a connecting portion and wherein proximal walls of successive folds are bridged by further portions, said folds having a mean width approximately equal to three times the thickness of said walls of said folds.
Claim 3
Dependent Claim
17 words
The cartridge defined in claim 1 wherein said folds extend parallel to the axis of said body.
Claim 4
Dependent Claim
14 words
The cartridge defined in claim 1 wherein said folds extend helically along said body.
Claim 5
Dependent Claim
19 words
The cartridge defined in claim 1 wherein at least some of said portions are in cross-sectional circular arc segments.
Claim 6
Dependent Claim
17 words
The cartridge defined in claim 1 wherein at least some of said portions are, in cross-section, polygonal.
Claim 7
Dependent Claim
14 words
The cartidge defined in claim 1 wherein said walls of each fold converge outwardly.
Claim 8
Dependent Claim
15 words
The cartridge defined in claim 1 wherein said walls of each fold are mutually parallel.
Claim 9
Dependent Claim
24 words
The cartridge defined in claim 1 wherein said walls lie along secants to a circle sintered on the axis of said body in cross-section.
Claim 10
Dependent Claim
30 words
The cartridge defined in claim 1 wherein the walls of each fold define between them a flow passage having a mean width approximately equal to the thickness of said walls.
References Cited (Backward Citations)
US768951A
Cited
US2186440A
Cited
US2273589A
Cited
US3070233A
Cited
US2957235A
Cited
US3201858A
Cited
US3292792A
Cited
US3301402A
Cited
US3352423A
Cited
US3321088A
Cited
US3747765A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-02-06 | 1981-08-08 | 1982-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-02-06 | 1985-08-08 | 1986-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-02-06 | 1989-08-08 | 1990-02-07 | $7700.00 | Window Closed / Lapsed |