Patent US5937477A successfully refreshed from Google Patents.
US5937477A
Expired / Lapsed
US
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Vacuum cleaner
Assignee: Dyson Technology Ltd
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Filing: 1996-01-24
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Granted: 1999-08-17
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Expires: 2016-01-24
Abstract
Abstract The invention provides a vacuum cleaner (10) having a housing (12) containing an apparatus (22) for separating dirt and dust from an airflow. The vacuum cleaner is configured so as to allow the cleaner to be positioned on a flight of stairs. The forward end (32) of the housing is shaped so as to facilitate the sliding of the vacuum cleaner over the flight of stairs in an upward direction.
Inventors
- 👤 James Dyson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 19:53
CPC Classifications
A; A47; A47L; A47L9/00; A47L5/00; A47L5/12; A47L5/22; A47L5/36; A47L5/367
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
135 words
A vacuum cleaner comprising a housing containing an apparatus for separating dirt and dust from an airflow, a base of the housing incorporating an upwardly extending recess for accommodating a stair nosing, and contact portions arranged on either side of the recess for contacting two adjacent stair treads of a flight of stairs and supporting the vacuum cleaner thereon, the forward end of the housing having an upwardly inclined nose with a smooth, inclined lower surface wherein when the vacuum cleaner is supported on the two adjacent stair treads, the smooth lower surface extends towards an upper stair nosing immediately above the stair nosing accommodated by the recess and is inclined to the vertical so that the smooth, lower surface facilitates sliding of the vacuum cleaner in an upward direction over the flight of stairs.
Claim 2
Dependent Claim
135 words
A vacuum cleaner comprising a housing containing an apparatus for separating dirt and dust from an airflow, a base of the housing incorporating an upwardly extending recess for accommodating a stair nosing, and contact portions arranged on either side of the recess for contacting two adjacent stair treads of a flight of stairs and supporting the vacuum cleaner thereon, the forward end of the housing having an upwardly inclined nose with a smooth, inclined lower surface wherein when the vacuum cleaner is supported on the two adjacent stair treads, the smooth lower surface extends towards an upper stair nosing immediately above the stair nosing accommodated by the recess and is inclined to the vertical so that the smooth, lower surface facilitates sliding of the vacuum cleaner in an upward direction over the flight of stairs.
Claim 3
Dependent Claim
17 words
A vacuum cleaner as claimed in claim 1, wherein the smooth, inclined lower surface is substantially planar.
Claim 4
Dependent Claim
33 words
A vacuum cleaner as claimed in claim 2, wherein the upwardly extending recess has a rearward inclined surface which is substantially parallel to the smooth, planar lower surface of the upwardly inclined nose.
Claim 5
Dependent Claim
27 words
A vacuum cleaner as claimed in any one of claims 1, 2 or 3, wherein the apparatus for separating dirt and dust from the airflow is cyclonic.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2002-08-16 | 2003-02-15 | 2003-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-08-16 | 2007-02-15 | 2007-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-08-16 | 2011-02-15 | 2011-08-17 | $7700.00 | Window Closed / Lapsed |