US3553941A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filtering assembly including a multiplicity of interconnected plenum chambers
Assignee: Delbag Luftfilter GmbH
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Filing: 1969-02-05
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Granted: 1971-01-12
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Expires: 1989-02-05
Abstract
Abstract AN AIR-FILTER ASSEMBLY IS FORMED FROM A MULTIPLICITY OF INTERCONNECTED IDENTICAL UNITS EACH HAVING A PLENUM CHAMBER WITH A FRUSTOCONICAL OR FRUSTOPYRAMIDAL HOUSING CLOSED AT ITS NARROW END AND TERMINATING AT ITS BROAD END IN A FILTER CELL, AN INLET PORT AND AN OUTLET PORT FOR AIR TO BE FILTERED EXTENDING LATERALLY FROM OPPOSITE SIDES OF THE HOUSING. THESE UNITS ARE INTERCONNECTED BY THEIR INLET AND OUTLET PORTS INTO AT LEAST ONE LINEAR ARRAY WHOSE PORTS ARE SUCCESSIVELY TRAVERSED BY COMPRESSED AIR FROM A BLOWER WORKING INTO THE FIRST INLET PORT OF EACH ROW.
Inventors
- 👤 Hans-Joachim Wittemeier
- 👤 Gerhard Max Neumann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:32
CPC Classifications
B; B01; B01D; B01D47/00; B01D47/06
Claims Analysis
Total Claims: 0
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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) | 1974-01-11 | 1974-07-13 | 1975-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-11 | 1978-07-13 | 1979-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-11 | 1982-07-13 | 1983-01-12 | $7700.00 | Window Closed / Lapsed |