Did You Know...
...that after Walter Hunt patented the safety pin in 1849, he sold the rights to it for $400?
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| Number | Title | Issue Date |
| 5630762 | Method of making a bowling pin having expanded copolymer core Bowling pins formed by molding a plastic shell about a foamed plastic core have not heretofore come into practical use because of inability to withstand shocks in service, resulting in separation of the shell from the core. According to the present invent... | 05/20/1997 |
| 5354239 | Bowling pin with interlocking shell to form core and base A method for forming a plastic composite bowling pin includes removing the surface skin of a foam core, mounting a plastic base ring on such core, and molding a relatively thick elastomer shell around the prepared core and the base ring so that the harden... | 10/11/1994 |
| 4569521 | Composite baseball bat having swaged spar and plastic foam covering A composite baseball bat has a unique tapered aluminum spar encased in polyurethane foam. The tapered spar is formed by swaging, starting with an aluminum tube whose outer diameter and wall thickness are those for the barrel section of the bat. A tapering... | 02/11/1986 |
| 4351786 | Method for making a stress-relieved composite foamed resin baseball bat or bowling pin Composite bowling pins and baseball bats are formed with foamed, cured-in place plastic bodies securely adhered to a central aluminum core by a somewhat thermoplastic adhesive coating. The exothermic reaction attendant to curing the plastic so softens the... | 09/28/1982 |
