|Publication number||USRE32842 E|
|Application number||US 07/099,163|
|Publication date||24 Jan 1989|
|Filing date||25 Aug 1987|
|Priority date||7 Mar 1983|
|Publication number||07099163, 099163, US RE32842 E, US RE32842E, US-E-RE32842, USRE32842 E, USRE32842E|
|Inventors||Luis L. Wigoda|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (8), Referenced by (5), Classifications (7), Legal Events (2)|
|External Links: USPTO, USPTO Assignment, Espacenet|
The purpose of this invention is to avoid controversy at the tennis courts, when there is a disagreement among players as where the tennis ball touched, that is, if it is inside or outside the lines.
The invention consists of a contrast of colors between two layers of different coloring. The bottom one is of a darker shade (preferably black). The layer above is a flexible transparent chamber that contains a high consistency fluid of oily type, colored and non dryable. This fluid will move freely in the flexible transparent chamber or bag which is of one millimeter or more of thickness. This fluid remains inside and is limited to the chamber.
Above the chamber there will be a strong transparent slightly flexible material, made of plastic or any other material that will stand the heavy tear and wear of a tennis court. All these layers will be placed along the tennis court lines. They could be placed on the surface or "built in" under the level of the tennis court surface, as long as they are built in a manner that does not interfere with the game.
The transparent cover and the flexible transparent chamber will have a slight flexibility, allowing the inside fluid in the chamber to be displaced at touch. When displaced, the darker bottom color will appear, giving a combination of colors, which will give a momentary impression to the eye, as where the ball hit.
FIG. 1 and FIG. 2 show three layers. Letter A. A transparent flexible strong material covering the invention. Letter B. A flexible transparent chamber, filled with oily consistency type of fluid, non dryable and displacable at touch.
FIGS. 3 and 4 show where the ball hit.
FIG. 5 shows the disappearance of the impression left by the ball a few moments later.
The invention consists of a combination of different layers of colors, which gives a change of color at touch. The middle layer fluid is displaced momentarily, therefore allowing the darker bottom layer (C) of paint to appear, leaving no doubt where the tennis ball hit. It reverses a few seconds later.
A transparent flexible chamber B of one millimeter or more in thickness, which contains a high density fluid of oily consistency, colored, easily displacable, non dryable which may be of one or different tones or colors. When applying pressure, or at touch over the surface of this area, the fluid will move momentarily, leaving a mark of a different color, nevertheless, it will return to the original color a few seconds later.
The bottom area (C) will be of a dark color preferably black, this color will make a contrast with the transparent flexible chamber (B) containing the oily fluid.
The top layer (A) which can be built as part of the middle chamber will be transparent, slightly flexible, it could be made of plastic or any other material that will give a strong resistance for heavy wear and tear.
This invention could be placed along the lines of the tennis court, in or outside, preferably out. It could go on the surface or "built-in" up to the level of the tennis court.
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|Citing Patent||Filing date||Publication date||Applicant||Title|
|US5394824 *||8 Mar 1994||7 Mar 1995||Johnson, Jr.; Lawrence F.||Thermochromic sensor for locating an area of contact|
|US6837809 *||10 Mar 2003||4 Jan 2005||Ramendra Nath Majumdar||Practice device for a baseball pitcher|
|US7632197 *||23 Apr 2007||15 Dec 2009||Write Stuff Enterprises, Inc.||System for confirming hit locations on tennis court boundaries|
|US20040180736 *||10 Mar 2003||16 Sep 2004||Majumdar Ramendra Nath||Practice device for a baseball pitcher|
|US20070249435 *||23 Apr 2007||25 Oct 2007||Rodengen Jeffrey L||System for confirming hit locations on tennis court boundaries|
|International Classification||A63C19/06, A63B71/06|
|Cooperative Classification||A63C19/065, A63B71/0605|
|European Classification||A63C19/06B, A63B71/06B|
|15 Feb 1989||FPAY||Fee payment|
Year of fee payment: 4
|5 Sep 1993||LAPS||Lapse for failure to pay maintenance fees|