US3568413A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Suction cleaners
Assignee: Dustbane Products Ltd
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Filing: 1969-07-23
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Granted: 1971-03-09
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Expires: 1989-07-23
Abstract
Abstract A FILTER FOR GAS CLEANERS, PARTICULARLY AIR CLEANERS FOR INDUSTRIAL AND DOMESTIC CLEANERS, IN WHICH THE FILTER HAS AN OUTER DEPENDING TUBULAR PART AND AN INNER RE-ENTRANT TUBULAR POART EXTENDING UPWARDS INSIDE OF AND SPACED FROM THE OUTER PART. THERE IS THUS A FLOW REVERSAL INTO THE INNER PART WHICH SLOWS DOWN THE GAS FLOW WITH IMPROVED FILTERING. AS AN ADDITIONAL FEATURE TO IMPROVE SELFCLEANING OF FILTER A FREELY SUPPORTED FRAME CAN BE POSITIONED BETWEEN THE INNER AND OUTER PARTS, THE FRAME BEING LIFTED DURING THE OPERATION OF THE APPARATUS AND DROPPING WHEN THE APPARATUS IS SHUT OFF. THIS AGITATES THE FILTER AND CAUSES DUST AND OTHER MATERIAL TO FALL OFF THE FILTER.
Inventors
- 👤 Bohumil Jerabek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:05
CPC Classifications
A; A47; A47L; A47L9/00; A47L9/20
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) | 1974-03-08 | 1974-09-07 | 1975-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-08 | 1978-09-07 | 1979-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-08 | 1982-09-07 | 1983-03-09 | $7700.00 | Window Closed / Lapsed |