US3280985A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluid filter arrangement
Assignee: American Air Filter Co Inc
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Filing: 1963-08-26
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Granted: 1966-10-25
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Expires: 1983-08-26
Abstract
No abstract record available.
Inventors
- 👤 Lawrence J Czerwonka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 02:59
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/52; B01D46/521; B01D46/523; B01D29/00; B01D29/01; B01D29/05; B01D29/07; B01D46/10
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
136 words
A FILTER CARTRIDGE FOR A UNIT TYPE FLUID FILTER COMPRISING; (A) AN UPSTREAM WEB OF SUBSTANTIALLY THREE DIMENSIONAL FIBROUS FILTER MEDIUM; (B) A DOWNSTREAM WEB OF SUBSTANTIALLY TOW DIMENTIONED IN COEXTENDING FACED REALTIONSHIP TO SAID FIRST WEB OF MEDIUM; (C) SAID DOWNSTREAM WEB BEING FOLDED UPON ITSELF IN FACED SUBSTANTIALLY ADJACENT RELATION TO PROVIDE SETS OF SPACED PARALLEL THIN RIBS INTEGRAL WITH AND EXTENDING TRANSVERSELY ACROSS SAID WEB FACE SUBSTANTIALLY NORMAL TO THE FACE OF SAID WEB; (D) SAID WEBS BEING ARRANGED INPLEAT-FORM TO INCLUDE A PLURALITY OF ADJACENT SIDE-BY-SIDE PLEATS ADAPTABLE TO EXTEND ACROSS A FLUID STREAM TO BE TREATED; (E) SAID RIBS OF EACH SET BEING SO POSITIONED THAT EACH RIB OF A SET EXTENDS BETWEEN OPPOSITE DOWNSTREAM WALLS OF A PLEAT PARALLEL TO THE CREST THEREOF TO FORM STRUCTURAL SUPPORT FOR SAID PLEATS.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-10-24 | 1970-04-25 | 1970-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-10-24 | 1974-04-25 | 1974-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-10-24 | 1978-04-25 | 1978-10-25 | $7700.00 | Window Closed / Lapsed |