Patent US3588945A successfully refreshed from Google Patents.
US3588945A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Surface maintenance machine
Assignee: Tennant Co
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Filing: 1969-06-13
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Granted: 1971-06-29
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Expires: 1989-06-13
Abstract
Abstract A SURFACE MAINTENANCE MACHINE USING A TOOL SUCH AS A BRUSH, AND HAVING A FIRST VACUUM BLOWER FOR RECEIVING DUST AND DEBRIS FROM THE BRUSH, AND HAVING A SEPARATE VACUUM BLOWER FOR REMOTE USE WITH A HAND HELD CLEANING WAND. ELECTRICAL SWITCHING AND AIR VALVING CONTROLS ARE OPERATED FROM A SINGLE HAND CONTROL SO THAT ALTERNATELY THE BRUSH AND ITS ASSOCIATED VACUUM BLOWER WILL BE DRIVEN FROM A SINGLE MOTOR AND WHEN THE CONTROL IS IN ANOTHER POSITION THE BRUSH AND ITS ASSOCIATED VACUUM BLOWER WILL NOT BE POWER DRIVEN FROM THE MOTOR, BUT THE MOTOR WILL DRIVE THE SECOND VACUUM BLOWER FOR USE WITH THE HAND HELD WAND.
Inventors
- 👤 Keith N Krier
- 👤 Donald J Haub
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 03:32
CPC Classifications
A; A47; A47L; A47L5/00; A47L5/12; A47L5/22; A47L5/28; A47L5/30
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) | 1974-06-28 | 1974-12-28 | 1975-06-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-28 | 1978-12-28 | 1979-06-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-28 | 1982-12-28 | 1983-06-29 | $7700.00 | Window Closed / Lapsed |