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US 4,307,478 AGranted
Hollow tapered brush bristles
AssigneeAmetek, Inc.
InventorsJohn Ward, Robert Austin, Anthony Genovese
Life of this patent
Estimating the term…
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.
Claims4
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.
Dependencies are inferred from the claim text.