US4819291A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cleaning brush
Assignee: BRUSHTECH Inc RT 22 WALL STREET PLATTSBURGH NEW YORK 12901
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Filing: 1987-11-12
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Granted: 1989-04-11
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Expires: 2007-11-12
Abstract
Abstract A cleaning brush has a handle, an elongated stem formed from a flexible coil spring, bristles at the end of the stem and a stiff member extending axially within the coil spring from the handle a distance partly the length of the stem to allow flexibility only in the area between the end of the stiff member and the bristle portion.
Inventors
- 👤 Armen G. Gunjian
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 11:14
CPC Classifications
A; A46; A46B; A46B5/00; A46B5/06
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
141 words
A cleaning brush for cleaning the internal surface of a hollow workpiece comprising a handle, an elongated stem extending from the handle , and bristle means at the free end of the stem, characterized in that the stem is a one-piece, flexible, elongated coil spring having a uniform diameter, and an elongated rigid member is fixed to the handle and is fixed concentric with and rigidifies the coil spring stem and extends within the a length less than the length of the coil spring stem to a point spaced from the bristle means at the end of the stem, said rigid member limiting the flexibility of the coil spring to only the portion between the end of the stiff member and the bristle means whereby the elongated coil spring can serve to scrape the inner surface of a hollow work piece.
Claim 2
Dependent Claim
141 words
A cleaning brush for cleaning the internal surface of a hollow workpiece comprising a handle, an elongated stem extending from the handle , and bristle means at the free end of the stem, characterized in that the stem is a one-piece, flexible, elongated coil spring having a uniform diameter, and an elongated rigid member is fixed to the handle and is fixed concentric with and rigidifies the coil spring stem and extends within the a length less than the length of the coil spring stem to a point spaced from the bristle means at the end of the stem, said rigid member limiting the flexibility of the coil spring to only the portion between the end of the stiff member and the bristle means whereby the elongated coil spring can serve to scrape the inner surface of a hollow work piece.
Claim 3
Dependent Claim
47 words
A cleaning brush as defined in claim 1, wherein the bristle means includes a rigid stem portion in which the bristles are anchored, the length of the rigid stem portion being selected to be able to maneuver a bend in a small diameter tube to be cleaned.
Claim 4
Dependent Claim
24 words
A cleaning brush as defined in claim 2 having sizes and dimensions suitable for use in the venturi tube of a portable barbecue grille.
Claim 5
Dependent Claim
38 words
A cleaning brush as defined in claim 2, wherein the rigid stem portion in which the bristles are anchored and the elongated rigid member within the coil spring stem are separate sections of a twisted pair of wires.
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) | 1992-04-10 | 1992-10-10 | 1993-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-04-10 | 1996-10-10 | 1997-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-04-10 | 2000-10-10 | 2001-04-11 | $7700.00 | Window Closed / Lapsed |