US4071937A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filter cartridge with folded filter sheath
Assignee: Sintermetallwerk Krebsoege GmbH
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Filing: 1976-08-10
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Granted: 1978-02-07
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Expires: 1996-08-10
Abstract
Abstract A filter cartridge has a fluid-permeable support body formed externally with ribs and is closely surrounded by a "folded" (e.g. corrugated) sheath of sintered material. The support body may likewise be formed of sintered material and preferably the sheath and support body are sintered together.
Inventors
- 👤 Rainer Rohlig
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 18:18
CPC Classifications
B; B01; B01D; B01D39/00; B01D39/14; B01D39/20; B01D39/2027; B01D39/2041; B01D39/2044; B01D29/00; B01D29/11; B01D29/13; B01D29/15; B01D29/21; B01D29/31; B01D29/33; B01D29/333; B01D39/2031; B01D39/2034; B01D2201/00; B01D2201/18; B01D2201/188
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
70 words
A method of making a filter cartridge comprising the steps of: isostatically pressing sinterable material against a smooth core to form a tubular support body having a plurality of support ribs extending therealong; isostatically pressing a sinterable filter sheath substantially of constant wall thickness against said support body; pressing a headpiece onto said support body; and sintering said sheath, said support body and said headpiece simultaneously to bond them together.
Claim 2
Independent Claim
70 words
A method of making a filter cartridge comprising the steps of: isostatically pressing sinterable material against a smooth core to form a tubular support body having a plurality of support ribs extending therealong; isostatically pressing a sinterable filter sheath substantially of constant wall thickness against said support body; pressing a headpiece onto said support body; and sintering said sheath, said support body and said headpiece simultaneously to bond them together.
References Cited (Backward Citations)
US2267918A
Cited
US2957235A
Cited
US2963163A
Cited
US3241681A
Cited
US3656946A
Cited
US3984044A
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 |