US4307478A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hollow tapered brush bristles
Assignee: Specialty Filaments Inc
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Filing: 1980-04-01
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Granted: 1981-12-29
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Expires: 2000-04-01
Abstract
Abstract Improved paint brush bristles formed of synthetic materials are hollow and tapered with a central axial hollow. The tapered hollow bristles are characterized by their consistent wall thickness, i.e., ratio of cross-sectional hollow area to cross-sectional wall area remains consistent from one end of the bristle to the other; and by their consistency in neck-down location.
Inventors
- 👤 John Ward
- 👤 Robert Austin
- 👤 Anthony Genovese
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:07
CPC Classifications
A; A46; A46D; A46D1/00; A46D1/02; A46D1/0238; A46D1/0246; A46B; A46B2200/00; A46B2200/20; A46B2200/202; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2973; Y10T428/2975; Y10T428/2976
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
142 words
A plurality of tapered hollow bristles for association together to form a paint brush, said tapered hollow bristles each having a central axial hollow therethrough and being formed of synthetic resin; each said bristle being generally bottle-shaped with a butt portion at one end, a central neck-down portion and a tip portion; the length of said bristles being from 13/4 inches to 43/4 inches and the neck-down location being from approximately 1 inch from the butt end in the case of 2-inch bristles to approximately 13/4 inches from the butt end in the case of 43/4 inch bristles, all of said bristles having their neck-down locations at approximately the same distance from their butt ends; each said bristle having a consistent ratio of cross-sectional wall area to central opening along the entire length thereof, said ratio being in the range of 65-75:35-25.
Claim 2
Dependent Claim
142 words
A plurality of tapered hollow bristles for association together to form a paint brush, said tapered hollow bristles each having a central axial hollow therethrough and being formed of synthetic resin; each said bristle being generally bottle-shaped with a butt portion at one end, a central neck-down portion and a tip portion; the length of said bristles being from 13/4 inches to 43/4 inches and the neck-down location being from approximately 1 inch from the butt end in the case of 2-inch bristles to approximately 13/4 inches from the butt end in the case of 43/4 inch bristles, all of said bristles having their neck-down locations at approximately the same distance from their butt ends; each said bristle having a consistent ratio of cross-sectional wall area to central opening along the entire length thereof, said ratio being in the range of 65-75:35-25.
Claim 3
Dependent Claim
29 words
In a paint brush having a handle at one end and a plurality of bristles at the other end, the improvement wherein said bristles are those of claim 1.
Claim 4
Dependent Claim
16 words
A paint brush according to claim 2 wherein the tip end of said bristles are flagged.
Claim 5
Dependent Claim
21 words
A paint brush according to claim 3 wherein said bristles are formed of polyester, nylon, polyolefin or mixtures and/or blends thereof.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-12-28 | 1985-06-29 | 1985-12-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-12-28 | 1989-06-29 | 1989-12-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-12-28 | 1993-06-29 | 1993-12-29 | $7700.00 | Window Closed / Lapsed |