Billiard ball
US4142720A · kind A · utility
Inventor
Key dates
| Filing date | Jun 16, 1978 |
| Grant date | Mar 6, 1979 |
| Priority date | — |
| Expiry date | Jun 16, 1998 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S273/07
- WIPO fieldFurniture, games
- WIPO sectorOther fields
Abstract
A billiard ball having magnetically attractable characteristics such that it may be utilized on pool tables where separation of a scratched cue ball from the object balls is accomplished by use of a magnet. The ball has a spherical core of non-magnetic cured resinous material, selected from the group of polyester, epoxy, polyurethane and phenolic resins; the diameter of said ball is 21/8-21/4 inches and its weight is within the range of about 142 to 190 grams. Distributed within the core are magnetically attractable particles which are dispersed with such uniformity that the ball's anisotropy factor is not more than about 10 percent as the ball rotates about any of its axes. The preferred magnetically attractable material constitutes iron particles having a maximum size of about 0.020 inch, and ideally no larger than about -325 mesh. Another magnetically attractable filler is barium ferrite. The filler is positioned in such a way that a magnet in a table made in accordance with U.S. Pat. No. 3,362,710 (having a flux density of about 1000 gauss on its face) will attract the ball with a preferred minimum force of about 35% of the ball's weight, e.g., about 65 grams. To increase the a…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.