Patent US3087874A successfully refreshed from Google Patents.
Patent US3559381A successfully refreshed from Google Patents.
US3559381A
Expired / Lapsed
US
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Vacuum cleaner filter bag
Assignee: Studley Paper Co Inc
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Filing: 1968-10-31
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Granted: 1971-02-02
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Expires: 1988-10-31
Abstract
Abstract A VACUUM CLEANER FILTER BAG FORMED OF A BLANK SHEET OF MATERIAL FOLDED TO DEFINE A FRONT WALL, REAR WALL AND OPPOSING ACCORDION FOLDED SIDE WALLS, SAID BAG BEING CLOSED AT BOTH ENDS AND ACCESS MEANS BEING PROVIDED INTO THE INTERIOR OF SAID BAG IN SAID FRONT WALL, SAID REAR WALL BEING PROVIDED WITH A CONVENIENT HAND GRIP FOR CAUSING EXPANSION OF THE BAG.
Inventors
- 👤 John J Fesco
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 11:07
CPC Classifications
A; A47; A47L; A47L9/00; A47L9/10; A47L9/14
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) | 1974-02-01 | 1974-08-03 | 1975-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-01 | 1978-08-03 | 1979-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-01 | 1982-08-03 | 1983-02-02 | $7700.00 | Window Closed / Lapsed |