Gravity teaching aid

• US 5,810,602 A
• Filed: 02/20/1997
• Issued: 09/22/1998
• Est. Priority Date: 02/20/1997
• Status: Expired due to Fees

• Current Assignee: Daniel James Menelly
• Original Assignee: Daniel James Menelly
• Inventors: Menelly, Daniel James
• Primary Examiner(s): Hirsch, Paul J.
• Application Number:
  US08/803,336
• Time in Patent Office: 579 Days
• Field of Search: 434/300, 434/301, 434/302, 473/570, 473/464, 473/451, 473/458, 446/437, 150/150
• US Class Current: 434/302
• CPC Class Codes: A63B 2102/02 Tennis
• CPC Class Codes: A63B 2209/08 magnetic
• CPC Class Codes: A63B 39/00 Hollow non-inflatable balls , i.e. having no valves rigid balls A63B37/00
• CPC Class Codes: A63B 43/00 Balls with special arrangements
• CPC Class Codes: G09B 23/10 of solid bodies

Abstract

A gravity teaching aid in the form of a tennis ball which includes a magnet for retaining the tennis ball against a metal surface against the downward pull exerted by the earth'"'"'s magnetic field.

Claims

1. A method of forming a gravity teaching aid comprising the steps of:

providing a tennis ball having a spherical shape;

forming a slit opening in said tennis ball;

applying a compression force to said tennis ball to enlarge said slit opening; and

inserting a rare earth magnet within said opening.