Patent US3820186A successfully refreshed from Google Patents.
Patent US3614801A successfully refreshed from Google Patents.
US3614801A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary tubular brush
Assignee: Tennant Co
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Filing: 1970-04-22
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Granted: 1971-10-26
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Expires: 1990-04-22
Abstract
Abstract A TUBULAR BRUSH HAVING A TUB MADE OF FOAMED PLASTIC MATERIAL THAT HAS OUTER AND INNER SKINS OF SUBSTANTIAL THICKNESSES AND A CENTRAL FOAM LAYER, A PLURALITY OF TUFT HOLES EXTENDING THROUGH THE OUTER SKIN AND AT LEAST SUBSTANTIALLY THROUGH THE CENTRAL LAYER AND TUFTS SECURED IN THE HOLES BY STAPLES EXTENDING AT LEAST A SUBSTANTIAL DISTANCE INTO THE INNER SKIN. THE INNER AND OUTER SKINS ARE OF THE SAME MATERIAL AS THE CENTRAL LAYER, ALTHOUGH THE DENSITY THEREOF IS SUBSTANTIALLY GREATER THAN THAT OF THE CENTRAL LAYER. ALSO DISCLOSED ARE TUBULAR BRUSHES HAVING INTERLOCKING PORTIONS AND BRUSH TUBES HAVING SPLIT TUBULAR SECTIONS JOINED TOGETHER TO FORM A TUBE.
Inventors
- 👤 Ralph C Peabody
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 19:33
CPC Classifications
A; A46; A46B; A46B13/00; A46B13/001
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) | 1974-10-25 | 1975-04-26 | 1975-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-25 | 1979-04-26 | 1979-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-25 | 1983-04-26 | 1983-10-26 | $7700.00 | Window Closed / Lapsed |