# Patent

## Title
Underwater retrieval game method employing a submersible target

## Abstract

An underwater retrieval game system employs a submersible target having a combination of features that make it difficult to locate underwater. The body portion of the submersible target is translucent and has a density greater than water. The target may be tossed in a swimming pool and sink to the bottom. A game player may jump into the water and try to locate the target. A combination of additional features such as size, shape, and surface texture may make it more difficult to spot the target underwater. A submersible target may comprise a detection device, such as a small light, that is activated after a certain period of time or is activated remotely by a wireless signal. A game player may be challenged to find the targets before the detection device is activated, for example.

## Background
CROSS REFERENCE TO RELATED APPLICATIONS
This application claims the benefit of priority to U.S. provisional patent application No. 63/144,327, filed on Feb. 1, 2021; the entirety of which is hereby incorporated by reference herein.


BACKGROUND OF THE INVENTION
Field of the Invention
The invention relates an underwater retrieval game system employing a submersible target.
Background
Many people enjoy time spent with family and friends around a swimming pool. Kids and some adults enjoy diving in the pool and searching for and retrieving items tossed into the pool. How long it takes and/or how many items are retrieved may be bragging points or the factors of a homemade game. Most targets are really easy to find quickly however as they are easily detected from the pool surface. Also, many objects project a shadow and these shadows, which are regular shapes, make it even easier to find the targets.
SUMMARY OF THE INVENTION
The invention is directed to an underwater retrieval game system employing a submersible target having a combination of features that make it difficult to locate underwater. An exemplary submersible target is substantially transparent in water being made of a material or combination of materials having an index of refraction of no more than 1.5 and no less than 1.2. In addition, an exemplary submersible target has a density greater than water so that it will sink. The target may be tossed in a swimming pool and sink to the bottom. A game player may jump into the water and try to locate the target. A submersible target may comprise a detection device, such as a small light, that is activated after a certain period of time or is activated remotely by a wireless signal. A game player may be challenged to find the target or targets before the detection device is activated, for example. In addition to transparency, an exemplary submersible target may have a rough surface, a shape with non-linear edges, a discontinuous outer surface, and a size to make it and shadows produced by the submersible target more difficult to see by an observer from above the surface of the water or when underwater.
An exemplary submersible target may be made out of a material that visually blends in with water and is hard to distinguish from the pool bottom. The target may have an index of refraction of no more than about 1.52 and preferably about 1.51 or less, and even more preferably about 1.5 or less, and about 1.2 or more, wherein the index of refraction of water is 1.33. Put another way, the submersible target may have an index of refraction that is substantially the same as water, or within about 0.20 the index of refraction of water (1.13 to 1.53). The closer the refractive index of the submersible target to that of the water it is submerged in, the more difficult it will be to locate.
The submersible target may be made out of a polymeric material and may be elastomeric. An elastomeric material is a material that can be deformed and then recover substantially to an original undeformed shape upon removal of a deforming force. An example of an elastomeric material is silicone and some urethane materials. An exemplary submersible target comprises silicone or polydimethylsiloxane which is an elastomer or elastomeric material.
The polymers listed in Table 1 have an index of refraction, or refractive index that is substantially the same as water such that they would be substantially transparent in water.








TABLE 1






Refractive


Polymer
Index
















Dimethyl silicone rubber
1.4


Methyl phenyl silicone rubber
1.40-1.60


Poly(hexafluoropropylene oxide)
1.301


Poly(tetrafluoroethylene-co-hexafluoropropylene)
1.338


Poly(pentadecafluorooctyl acrylate)
1.339


Poly(tetrafluoro-3-
1.346


(heptafluoropropoxy)propyl acrylate)



Poly(tetrafluoro-3-
1.348


(pentafluoroethoxy)propyl acrylate)



Poly(tetrafluoroethylene)
1.35


Poly(undecafluorohexyl acrylate)
1.356


Poly(nonafluoropentyl acrylate)
1.36


Poly(tetrafluoro-3-
1.36


(trifluoromethoxy)propyl acrylate)



Poly(pentafluorovinyl propionate)
1.364


Poly(heptafluorobutyl acrylate)
1.367


Poly(trifluorovinyl acetate)
1.375


Poly(octafluoropentyl acrylate)
1.38


Poly(methyl 3,3,3-trifluoropropyl siloxane)
1.383


Poly(pentafluoropropyl acrylate)
1.385


Poly(2-heptafluorobutoxy)ethyl acrylate)
1.39


Poly(chlorotrifluoroethylene)
1.39


Poly(2,2,3,4,4-hexafluorobutyl acrylate)
1.392


Poly(methyl hydro siloxane)
1.397


Poly (methacrylic acid), sodium salt
1.401


Poly(dimethyl siloxane)
1.4035


Poly(trifluoroethyl acrylate)
1.407


Poly(2-(1,1,2,2-tetrafluoroethoxy)ethyl acrylate
1.412


Poly(trifluoroisopropyl methacrylate)
1.4177


Poly(2,2,2-trifluoro-1-methylethyl methacrylate)
1.4185


Poly(2-trifluoroethoxyethyl acrylate)
1.419


Poly(vinylidene fluoride)
1.42


Poly(trifluoroethyl methacrylate)
1.437


Poly(methyl octadecyl siloxane)
1.443


Poly(methyl hexyl siloxane)
1.443


Poly(methyl octyl siloxane)
1.445


Poly(isobutyl methacrylate)
1.447


Poly(vinyl isobutyl ether)
1.4507


Poly(methyl hexadecyl siloxane)
1.451


Poly(ethylene oxide)
1.4539


Poly(vinyl ethyl ether)
1.454


Poly(methyl tetradecyl siloxane)
1.455


Poly(ethylene glycol mono-methyl ether)
1.4555


Poly(vinyl n-butyl ether)
1.4563


Poly(propylene oxide)
1.457


Poly(3-butoxypropylene oxide)
1.458


Poly(3-hexoxypropylene oxide)
1.459


Poly(ethylene glycol)
1.459


Poly(vinyl n-pentyl ether)
1.459


Poly(vinyl n-hexyl ether)
1.4591


Poly(4-fluoro-2-trifluoromethylstyrene)
1.46


Poly(vinyl octyl ether)
1.4613


Poly(vinyl n-octyl acrylate)
1.4613


Poly(vinyl 2-ethylhexyl ether)
1.4626


Poly(vinyl n-decyl ether)
1.4628


Poly(2-methoxyethyl acrylate)
1.463


Poly(acryloxypropyl methyl siloxane)
1.463


Poly(4-methyl-1-pentene)
1.463


Poly(3-methoxypropylene oxide)
1.463


Poly(t-butyl methacrylate)
1.4638


Poly(vinyl n-dodecyl ether)
1.464


Poly(3-ethoxypropyl acrylate)
1.465


Poly(vinyl propionate)
1.4664


Poly(vinyl acetate)
1.4665


Poly(vinyl propionate)
1.4665


Poly(vinyl methyl ether)
1.467


Poly(ethyl acrylate)
1.4685


Poly(vinyl methyl ether) (isotactic)
1.47


Poly(3-methoxypropyl acrylate)
1.471


Poly(1-octadecene)
1.471


Poly(2-ethoxyethyl acrylate)
1.471


Poly(isopropyl acrylate)
1.4728


Poly(1-decene)
1.473


Poly(propylene) (atactic)
1.4735


Poly(lauryl methacrylate)
1.474


Poly(vinyl sec-butyl ether) (isotactic)
1.474


Poly(n-butyl acrylate)
1.474


Poly(dodecyl methacrylate)
1.474


Poly(ethylene succinate)
1.4744


Poly(tetradecyl methacrylate)
1.4746


Poly(hexadecyl methacrylate)
1.475


Cellulose acetate butyrate
1.475


Cellulose acetate
1.475


Poly(vinyl formate)
1.4757


Ethylene/vinyl acetate copolymer-40% vinyl acetate
1.476


Poly(2-fluoroethyl methacrylate)
1.4768


Poly(octyl methyl silane)
1.478


Ethyl cellulose
1.479


Poly(methyl acrylate)
1.4793


Poly(dicyanopropyl siloxane)
1.48


Poly(oxymethylene)
1.48


Poly(sec-butyl methacrylate)
1.48


Poly(dimethylsiloxane-co-alpha-methyl styrene)
1.48


Poly(n-hexyl methacrylate)
1.4813


Ethylene/vinyl acetate copolymer-33% vinyl acetate
1.482


Poly(n-butyl methacrylate)
1.483


Poly(ethylidene dimethacrylate)
1.4831


Poly(2-ethoxyethyl methacrylate)
1.4833


Poly(n-propyl methacrylate)
1.484


Poly(ethylene maleate)
1.484


Ethylene/vinyl acetate copolymer-28% vinyl acetate
1.4845


Poly(ethyl methacrylate)
1.485


Poly(vinyl butyral)
1.485


Poly(vinyl butyral)-11% hydroxyl
1.485


Poly(3,3,5-trimethylcyclohexyl methacrylate)
1.485


Poly(2-nitro-2-methylpropyl methacrylate)
1.4868


Poly(dimethylsiloxane-co-diphenylsiloxane)
1.488


Poly(1,1-diethylpropyl methacrylate)
1.4889


Poly(triethylcarbinyl methacrylate)
1.4889


Poly(methyl methacrylate)
1.4893


Poly(2-decyl-1,4-butadiene)
1.4899


Polypropylene, isotactic
1.49


Poly(vinyl butyral)-19% hydroxyl
1.49


Poly(mercaptopropyl methyl siloxane)
1.49


Poly(ethyl glycolate methacrylate)
1.4903


Poly(3-methylcyclohexyl methacrylate)
1.4947


Poly(cyclohexyl alpha-ethoxyacrylate)
1.4969


Methyl cellulose
1.497


Poly(4-methylcyclohexyl methacrylate)
1.4975


Poly(decamethylene glycol dimethacrylate)
1.499


Poly(vinyl alcohol)
1.5


Poly(vinyl formal)
1.5


Poly(2-bromo-4-trifluoromethyl styrene)
1.5


Poly(1,2-butadiene)
1.5


Poly(sec-butyl alpha-chloroacrylate)
1.5


Poly(2-heptyl-1,4-butadiene)
1.5


Poly(vinyl methyl ketone)
1.5


Poly(ethyl alpha-chloroacrylate)
1.502


Poly(vinyl formal)
1.502


Poly(2-isopropyl-1,4-butadiene)
1.502


Poly(2-methylcyclohexyl methacrylate)
1.5028


Poly(bornyl methacrylate)
1.5059


Poly(2-t-butyl-1,4-butadiene)
1.506


Poly(ethylene glycol dimethacrylate)
1.5063


Poly(cyclohexyl methacrylate)
1.5065


Poly(cyclohexanediol-1,4-dimethacrylate)
1.5067


Butyl rubber (unvulcanized)
1.508


Gutta percha b
1.509


Poly(tetrahydrofurfuryl methacrylate)
1.5096


Poly(isobutylene)
1.51


Polyethylene, low density
1.51


Ethylene/methacrylic acid ionomer, sodium ion
1.51


Polyethylene
1.51


Cellulose nitrate
1.51


Polyethylene lonomer
1.51


Polyacetal
1.51


Poly(1-methylcyclohexyl methacrylate)
1.5111


Poly(2-hydroxyethyl methacrylate)
1.5119


Poly(1-butene) (isotactic)
1.5125


Poly(vinyl methacrylate)
1.5129


Poly(vinyl chloroacetate)
1.513


Poly(N-butyl methacrylamide)
1.5135


Gutta percha a
1.514


Poly(2-chloroethyl methacrylate)
1.517


Poly(methyl alpha-chloroacrylate)
1.517


Poly(2-diethylaminoethyl methacrylate)
1.5174


Poly(2-chlorocyclohexyl methacrylate)
1.5179


Poly(1,4-butadiene) (35% cis; 56% trans; 
1.518


7% 1,2-content)



Poly(acrylonitrile)
1.5187


Poly(isoprene), cis
1.5191


Poly(allyl methacrylate)
1.5196









An exemplary submersible target may be made out of a plastic that has a density greater than that of water, or greater than about 0.99823 g/cc at 20 degrees Celsius. Density is defined as the mass per unit volume and specific gravity is the density of a material at a certain temperature divided by the density of water. Therefore, a material with a specific gravity of greater than 1.0 will sink in water. Some plastics and elastomers have a density greater than water, such as fluoropolymers, silicones and urethanes. In some cases, an additive or filler may be added to the polymer that increases the density of the composite material. Table 2 lists some polymers that have a density greater than water.









TABLE 2






Min Value
Max Value


Polymer Name
(g/cm3)
(g/cm3)

















ABS - Acrylonitrile Butadiene Styrene
1.02
1.21


ABS Flame Retardant
1.15
1.2


ABS High Heat
1.1
1.15


ABS High Impact
1
1.1


ABS/PC Blend - Acrylonitrile Butadiene
1.1
1.15


Styrene/Polycarbonate Blend




ABS/PC Blend 20% Glass Fiber
1.25
1.25


ABS/PC Flame Retardant
1.17
1.19


Amorphous TPI Blend, Ultra-high heat,
1.37
1.37


Chemical Resistant (High Flow)




Amorphous TPI Blend, Ultra-high heat,
1.37
1.37


Chemical Resistant (Standard Flow)




Amorphous TPI, High Heat, High Flow,
1.52
1.52


Lead-Free Solderable, 30% GF




Amorphous TPI, High Heat, High Flow,
1.31
1.31


Transparent, Lead-Free Solderable (High




Flow)




Amorphous TPI, High Heat, High Flow,
1.31
1.31


Transparent, Lead-Free Solderable




(Standard Flow)




Amorphous TPI, Highest Heat,
1.42
1.42


Chemical Resistant, 260C UL RTI




Amorphous TPI, Moderate Heat,
1.3
1.3


Transparent




Amorphous TPI, Moderate Heat,
1.3
1.3


Transparent (Food Contact Approved)




Amorphous TPI, Moderate Heat,
1.3
1.3


Transparent (Mold Release grade)




Amorphous TPI, Moderate Heat,
1.3
1.3


Transparent (Powder form)




ASA - Acrylonitrile Styrene Acrylate
1.05
1.07


ASA/PC Blend - Acrylonitrile Styrene
1.15
1.15


Acrylate/Polycarbonate Blend




ASA/PC Flame Retardant
1.25
1.25


ASA/PVC Blend - Acrylonitrile Styrene
1.2
1.2


Acrylate/Polyvinyl Chloride Blend









A preferred material for the submersible target has a refractive index that is substantially the same as water, or within about 0.25 the index of refraction of water (1.08 to 1.58) and has a density greater than the density of water which is 0.99823 g/cc at 20 degrees Celsius, which causes the submersible target to sink. A material may have a specific gravity that is greater than 1.0, which means the density is greater than that of water, when measured at the same temperature.
An exemplary submersible target may be made out of a polymeric material that is molded into a desired shape. An exemplary polymeric material may be an elastomer, such as a silicone or urethane. An exemplary material for the submersible target a silicone elastomer, Sylgard 184, available from Dow Corning Corporation, which has a refractive index of about 1.4, which is substantially the same as water as defined herein, and a specific gravity of 1.03 g/cc, greater than water. Water has a density of about 0.997 g/cc at 25° C., a typical pool temperature. Another exemplary material that may be used to form the submersible target is a urethane, such as an elastic urethane, Clear Flex 95, available from Smooth-On, Inc, Macungie, PA, which has a specific gravity of 1.04 g/cc and an index of refraction that is substantially the same as water.
An exemplary target may comprise a combination of materials that achieve desired properties of being substantially transparent in water and having a density to cause the submersible target to sing. An exemplary submersible target allows a significant percentage of light to pass therethrough, having a light transmissibility of about 80% or more, about 85% or more, about 90% or more or event 95% or more. The higher the transmissibility, the more light will pass therethrough, thereby enabling features on the bottom of the pool or underneath the submersible target to be visible.
An exemplary submersible target may comprise a thin layer, or covering layer, configured around the outside of the submersible target. This thin covering layer may have an index of refraction that is not substantially the same as water, but may be thin enough to produce a submersible target that is still very difficult to identify when submersed on the bottom of a pool. A thin covering layer may produce less distortion of light passing therethrough. For example, the thin layer, or thin covering layer may have a thickness of about 2 mm or less, about 1.5 mm or less, about 1 mm or less and any range between and including the thicknesses provided. A thin covering layer may form a durable covering or shell that may be hollow or have another material configured therein, such as a material that has an index of refraction that is substantially the same, or effectively the same as water, as defined herein. The combined effect of the layers of materials with varied refractive indexes may produce minimal distortion of light such that it is very difficult to identify the submersible target when submersed in a pool.
An exemplary submersible target or body portion of the submersible target may be made from a hydrogel or comprise a hydrogel, and the hydrogel may be crosslinked include additives, or be made with processing techniques for durability as a pool toy. Some hydrogels have an index of refraction that is effectively the same as that of water, or within about 0.1 the index of refraction of water. Hydrogels may swell with water and this may aid in gameplayers finding the submersible target over time. A hydrogel may be contained within an enclosure, such as a covering layer, for additional durability, such as a thin layer or cover. The covering layer may be made out of an elastic material and may be water permeable, such that the submersible target grows in size when tossed in the pool as the hydrogel swells with water permeating through the covering. A hydrogel absorbs water and may include Heavy water or deuterium oxide.
An exemplary body portion may comprise heavy water, which may be contained within a covering layer. Heavy water (deuterium oxide), is a form of water that contains only deuterium, H or D, also known as heavy hydrogen rather than the common hydrogen-1 isotope, also called protium, that makes up most of the hydrogen in normal water. The presence of the heavier hydrogen isotope gives the water different nuclear properties, and the increase of mass gives it slightly different physical and chemical properties when compared to normal water. Heavy water is not radioactive. In its pure form, it has a density about 11% greater than water, but is otherwise physically and chemically similar.
In addition, a submersible target may produce shadows and these shadows may make detection easier. Therefore, it may be desirable for the submersible target to have a perimeter or shape that produces no easily detected shadows. A submersible target may have a shape that makes it more difficult to locate when submerged in a pool. The shape may be irregular having limited linear portions or edges or continuously curved portions or edges. An exemplary submersible target may have a discontinuous shape including the outer surface, perimeter and edges, wherein these surfaces are undulating and are substantially free of linear segments or smooth curved segments, planar or curved surfaces and/or linear or curved edges. Smooth continuous surfaces may be more easily seen by game players or may cast a shadow having a regular shape or edge that makes it easier to find.
An exemplary submersible target has a body portion with a substantially discontinuous outer surface, wherein the outer surfaces are non-linear or a non-continuous curve. Also, the perimeter and edges of the outer surface may be discontinuous wherein they are non-linear or a non-continuous curve. A preferred outer surface is undulating, having protrusions extending from the surface that break up the surface and make it blend in with the water. Also, the protrusions may project a discontinuous shadow, thereby making the target difficult to find. The protrusions on the outer surface may be rounded protrusions having a radius of curvature of about 0.5 cm to about 2 cm or more. An exemplary submersible target has a discontinuous outer surface, wherein the surface when viewed from any angle has no continuous surface area, planar or a continuous curve, greater than 10 cm2, and preferably no more than 5 cm2. Likewise, a submersible target having a substantially discontinuous perimeter or edge that has a perimeter that is non-linear or follows a non-continuous curve, wherein there are no linear segments or continuous curve segment of more than about 10 cm, and preferably more than 5 cm. The edges of a submersible target may also be discontinuous and may not be orthogonal, but rather undulating and substantially discontinuous as defined for the perimeter.
An exemplary submersible target may have a puck shape, having a generally circular or round shape that a thickness that is less than the diameter. A puck shaped body portion of the submersible target may have a discontinuous outer surface, perimeter and edges. Another exemplary shape is a cylindrical body having a plurality of protrusions such as fins extending therefrom. An exemplary submersible target has a central body portion and a plurality of protrusions such as fins. The fins or protrusions may be configured around the exposed surface of the submersible target when resting on a bottom of the submersible target. The fins may act to break up the surface of the submersible target and scatter light in such a way to make the submersible target blend in with the water and surrounding surfaces. Again, smooth continuous surfaces may be more easily seen by game players. The outer surfaces, as described herein, may include the exposed surfaces when the submersible target is resting on the swimming pool floor.
An exemplary submersible target has rough surfaces, or surfaces having a surface roughness, Ra value, of 0.35 μm or more. This average Ra value is considered a matte finish. An exemplary submersible target may have a fine matte finish or a rougher surface, as described in Table 3. The average Ra surface roughness as determined by Society of Plastic Industry, may be 0.35 μm or more, 0.45 μm or more, 0.63 μm or more, 1.0 μm or more, 3.0 μm or more and any range between and including the values provided.









TABLE 3







Typical surface


Finish
SPI* standard
roughness Ra (μm)







Super High Glossy
A-1
0.012 to 0.025


finish




High Glossy finish
A-2
0.025 to 0.05 


Normal Glossy finish
A-3
0.05 to 0.10


Fine Semi-glossy
B-1
0.05 to 0.10


finish




Medium Semi-glossy
B-2
0.10 to 0.15


finish




Normal Semi-glossy
B-3
0.28 to 0.32


finish




Fine Matte finish
C-1
0.35 to 0.40


Medium Matte finish
C-2
0.45 to 0.55


Normal Matte finish
C-3
0.63 to 0.70


Satin Textured finish
D-1
0.80 to 1.00


Dull Textured finish
D-2
1.00 to 2.80


Rough Textured finish
D-3
3.20 to 18.0









In some cases, a sinker may be included in the submersible target. A sinker is a material with a density greater than water, such as about 1.2 g/cm3 or more, about 2.0 g/cm3 or more, about 3.0 g/cm3 or more, about 4.0 g/cm3 or more and any range between and including the values provided. A sinker preferably has a refractive index substantially the same as water, as defined herein. Exemplary sinker materials, include glass, dense plastics as provided in Table 2, fluoropolymers, and the like. An exemplary sinker may be configured proximal to or on the bottom surface of the submersible target to cause the submersible target to sink and rest on the bottom of the submersible target. The bottom of the submersible target may be smooth and flat and have no protrusions, where the exposed submersible target may be rough and have a discontinuous outer surface, as described herein. Some metals have a density that is very high and therefore would require less volume to produce an effective sinker. Some very dense metals or metals with a density of more than about 5 g/cm3 include, but are not limited to, tungsten, osmium, platinum, gold, and the like.
An exemplary submersible target may be sized to make it possible to find, but not too large such that it is easy to find. An exemplary submersible target may have no dimension, length, width, height, or diameter of more than about 15 cm and preferably no more than bout 12 cm and at least 2 cm or more, or at least 4 cm, and any range between and including the sizes provided, such as between about 4 cm and about 15 cm. The target should be large enough to prevent it from fitting through screens of the filters in the swimming pool.
An exemplary submersible target further has a detection device, such as a light. The light may be very small, such as less than 1 cm in dimension and may be a light emitting diode (LED). A small battery, such as a button battery, may be used to power the light. A submersible target may have a timer that actives the detection device or light to turn on after an activation time has transpired. The timer may be turned on by an activation button, or the submersible target may have a submersion detector that detects when the submersible target is submerged in water. The detection device timer may be activated by a controller when the submersion detector detects submersion. The light may automatically come on after the expiration of the timer time.
In an exemplary embodiment, the submersible target has a wireless signal receiver configured to receive a wireless signal from a remote electronic device, such as a mobile phone. The controller may pair or synch with the remote electronic device to receive and recognize the wireless signal. A game activator may use the remote electronic device to activate the timer or activate the detection device. For example, one or more of the submersible targets may be tossed in a pool and a game activator may allow the game players to search for a while for the targets. If they cannot find the target or targets, the game activator may use the remote electronic device to turn on a timer or turn on the detection device so the game players can more easily find the submersible targets.
An exemplary submersible target may be configured to be more easily detected of seen when special eyewear or goggles are worn. The body portion may polarize the light and polarized goggles may make it easier to spot. A body portion may include a pigment that produces a non-visible wavelength of light that is detected when viewed through goggles, for example.
The summary of the invention is provided as a general introduction to some of the embodiments of the invention, and is not intended to be limiting. Additional example embodiments including variations and alternative configurations of the invention are provided herein.



BRIEF DESCRIPTION OF SEVERAL VIEWS OF THE DRAWINGS
The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention, and together with the description serve to explain the principles of the invention.
FIG. 1 shows a side view of an exemplary submersible target having a discontinuous body portion, a sinker, a light detection device and a wireless receiver.
FIG. 2 shows a top view of the exemplary submersible target shown in FIG. 1.
FIG. 3 shows a side view of a child game player retrieving a submersible target from the bottom surface of a pool.
FIG. 4 shows a side view of a game activator on the deck of the pool activating a light detection device to help the child game player find the submersible target.
FIG. 5 shows a perspective view of an exemplary submersible target having a discontinuous body portion, a sinker, a light detection device and a wireless receiver.
FIG. 6 shows a top view of the exemplary submersible target shown in FIG. 5.
FIG. 7 shows a side cross-sectional view of the submersible target shown in FIG. 5.



Corresponding reference characters indicate corresponding parts throughout the several views of the figures. The figures represent an illustration of some of the embodiments of the present invention and are not to be construed as limiting the scope of the invention in any manner. Some of the figures may not show all of the features and components of the invention for ease of illustration, but it is to be understood that where possible, features and components from one figure may be included in the other figures. Further, the figures are not necessarily to scale, some features may be exaggerated to show details of particular components. Therefore, specific structural and functional details disclosed herein are not to be interpreted as limiting, but merely as a representative basis for teaching one skilled in the art to variously employ the present invention.
DETAILED DESCRIPTION OF THE ILLUSTRATED EMBODIMENTS
As used herein, the terms “comprises,” “comprising,” “includes,” “including,” “has,” “having” or any other variation thereof, are intended to cover a non-exclusive inclusion. For example, a process, method, article, or apparatus that comprises a list of elements is not necessarily limited to only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Also, use of “a” or “an” are employed to describe elements and components described herein. This is done merely for convenience and to give a general sense of the scope of the invention. This description should be read to include one or at least one and the singular also includes the plural unless it is obvious that it is meant otherwise.
Certain exemplary embodiments of the present invention are described herein and are illustrated in the accompanying figures. The embodiments described are only for purposes of illustrating the present invention and should not be interpreted as limiting the scope of the invention. Other embodiments of the invention, and certain modifications, combinations and improvements of the described embodiments, will occur to those skilled in the art and all such alternate embodiments, combinations, modifications, improvements are within the scope of the present invention.
Referring to FIGS. 1 and 2, an exemplary underwater retrieval game system 10, includes a submersible target 40 that has a body portion 41 with a discontinuous outer surface 50 comprises of a plurality of protrusions 52, such as fins 54 as shown. The discontinuous outer surface may make is more difficult for a game player to locate the submersible target, as described herein. Also, the discontinuous outer surface 50 may be effectively rough, wherein there is no smooth surface over an area of 5 cm2 or more, as defined herein. Also, the body portion and protrusions, such as fins, may be made out of a material that has an index of refraction that is substantially the same as water, or no more than about 1.5 and no less than about 1.2. The body portion and/or the protrusions may be an elastomeric material that is translucent and may have an effective density cause the submersible target to sink in water. The body portion has a height 43 from the bottom 44 to the top 42 and a width 45 of the widest part of the body portion extending orthogonally from the height. Note that a width may be a diameter of the body portion.
The exemplary submersible target also has a sinker 60, that may be configured within the body portion to aid in sinking the submersible target to the bottom surface of a pool. A sinker may have a density greater than 1.0 g/cc to that will cause the submersible target to sink in water. As described herein the sinker may be made out of material that has an index of refraction that is substantially the same as water, or no more than about 1.5 and no less than about 1.2, such as glass. Also, the sinker may be effectively transparent. As shown, the sinker may be configured proximal to the bottom 44 of the body portion 41 of the submersible target 40. The location of the sinker may be configured to cause the submersible target to sink and rest on the bottom 38 of the pool 30, as shown in FIGS. 3 and 4.
The exemplary submersible target has a detection device 65, such as a light 67. The light may be very small, such as a LED light, to prevent easy detection of the submersible target when underwater. The light may be configured to turn on after a period of time after submersion in water which may be determined by the timer 74. A controller 70 may activate the light to turn on after a set time from submersion, as detected by the submersion detector 78. Alternatively, the timer may be activated by an activation button 79. A user may activate the time and toss the submersible target into the pool and the light will automatically turn after the set time has expired. A small battery 72, such as a button battery, may be used to power the controller, detection device and the like.
As exemplary submersible target may be configured with a wireless signal receiver 76, wherein the detection device 65, such as the light 67, may be activated by remote electronic device 80, such as a mobile phone 82. The remote electronic device 80 may send a wireless signal 86 from a transmitter 84 that activates the detection device to turn on. The controller 70 may control the functions of the detection device and may include a microprocessor.
Referring now to FIGS. 3 and 4, the exemplary submersible target is shown without all the references as shown in FIGS. 1 and 2, or FIGS. 5-7. As shown in FIG. 3, a game player 20, a child, is diving down into the water 34 of a pool 30 to retrieve the submersible target 40. The target is below the water level 32 and is resting on the bottom 38 or bottom surface of the pool. A parent or game activator 22 is standing on the deck 36 of the pool. The parent has a remote electronic device 80, such as a mobile phone 82 that may activate a game detection device.
As shown in FIG. 4, the game activator 22 has activated the detection device, the light 67 to come on. The game activator 22 interfaced with the remote electronic device 80 to produce a wireless signal 86 that is recognized by the controller when received by the receiver. The child is swimming away from the submersible target and therefore the game activator as activated the detection device to make it easier to locate.
Referring now to FIGS. 5 to 7, the exemplary submersible target 40 has a discontinuous outer surface, wherein the discontinuous outer surfaces 50 are not planar or a continuous curved surface. Rather, the surfaces are undulating or wavy having a plurality of protrusions 52 that project a shadow that is also wavy and discontinuous, thereby making the submersible target very difficult to find when submersed in a pool. The discontinuous outer surface may have no area greater then 5 cm2 that is planar or follows a smooth curve. The coin shaped submersible target forms a perimeter that is also a substantially discontinuous perimeter 56, wherein when viewed from any angle, the perimeter is substantially non-linear or follows a continuous curve. As shown, the perimeter is undulating and irregular, whereby the undulations are not regular. Also, the edges, or the area between surfaces, such as the top surface 42 and the side surfaces 46, are substantially discontinuous edges 58, whereby they are non-linear or follow a continuous curve. Again, the edges are undulating and irregular, whereby the undulations along the edges are not regular in pattern. Again, the shadows produced by this submersible target would make the target very difficult to find when submersed in a pool.
The exemplary coin shaped submersible target has a cover layer 90 that may be made out of a different material that a material contained within the cover layer. As described herein the cover layer may be thin, such as less than 2 mm and may have an index of refraction that is substantially the same as water. The cover layer and an interior material may have indexes of refraction that are different, by as much as about 0.1 more, about or 0.2, about 0.3 or more, or even about 0.4 or more. This difference in index of refraction may distort the light passing through the submersible target, making it difficult to identify or locate when submersed in a pool.
The exemplary coin shaped submersible target has a detection device 65, such as a light 67. The light may be very small, such as a LED light, to prevent easy detection of the submersible target when underwater. The light may be configured to turn on after a period of time after submersion in water which may be determined by the timer 74. A controller 70, such as a microprocessor, may activate the light to turn on after a set time from submersion, as detected by the submersion detector 78. Alternatively, the timer may be activated by an activation button 79. A user may activate the time and toss the submersible target into the pool and the light will automatically turn after the set time has expired.
As exemplary submersible target may be configured with a wireless signal receiver 76, wherein the detection device 65, such as the light 67, may be activated by remote electronic device 80, such as a mobile phone 82. The remote electronic device 80 may send a wireless signal 86 from a transmitter 84 that activates the detection device to turn on. The controller 70 may control the functions of the detection device and may include a microprocessor.
It will be apparent to those skilled in the art that various modifications, combinations and variations can be made in the present invention without departing from the scope of the invention. Specific embodiments, features and elements described herein may be modified, and/or combined in any suitable manner. Thus, it is intended that the present invention cover the modifications, combinations and variations of this invention provided they come within the scope of the appended claims and their equivalents.

## Claims

1. A submersible target retrieval game method comprising:
a) providing a submersible target comprising:
i) a body portion that is substantially transparent in water being made of a material having an index of refraction of no more than 1.5 and no less than 1.2;

wherein the submersible target has a density of 1.0 g/cc or more;
wherein the body portion is a polymeric material;
b) placing the submersible target in water contained within a pool;
c) allowing the submersible target to sink in said water to a bottom of the pool; and
d) swimming in said pool and locating the submersible target and retrieving the submersible target; and
wherein the submersible target has a top and side surfaces when resting on a bottom of a pool and wherein said top and side surfaces are discontinuous outer surfaces having no continuous surface area greater than 5 cm2 with a surface roughness of less than 0.35 μm Ra;
wherein the body portion has a substantially discontinuous perimeter having no linear segments or continuous curve segment of more than about 10 cm in length; and
wherein the discontinuous perimeter comprises edges between surfaces and wherein the edges are substantially discontinuous edges having no linear segments or continuous curve segment of more than about 10 cm in length;
whereby the discontinuous outer surfaces, the substantially discontinuous perimeter with substantially discontinuous edges produce an irregular shadow on said bottom of said pool when the submersible target is resting on said bottom of said pool to make said submersible target difficult to locate.

2. The submersible target retrieval game method of claim 1, wherein the submersible target consists of a polymeric material.

3. The submersible target retrieval game method of claim 1, wherein the body portion is an elastomeric material.

4. The submersible target retrieval game method of claim 1, wherein the submersible target consists of an elastomeric material.

5. The submersible target retrieval game method of claim 1, wherein the body portion has a density greater than 1.0 g/cc to cause the target to sink in said water.

6. The submersible target retrieval game method of claim 1, wherein the submersible target further comprises a sinker having a density greater than 1.2 g/cm3 and an index of refraction of no more than 1.5 and no less than 1.2.

7. The submersible target retrieval game method of claim 6, wherein the sinker comprises glass.

8. The submersible target retrieval game method of claim 6, wherein the sinker is no more than 25% of the submersible target by volume.

9. The submersible target retrieval game method of claim 8, wherein the body portion consists of a polymeric material.

10. The submersible target retrieval game method of claim 1, wherein the body portion comprises a plurality of protrusions extending from the body portion.

11. The submersible target retrieval game method of claim 10, wherein the plurality of protrusions are fins that extends outward from the body portion.

12. The submersible target retrieval game method of claim 11, wherein the body portion is cylindrical in shape.

13. The submersible target retrieval game method of claim 1, wherein the submersible target further comprises a light detection device.

14. The submersible target retrieval game method of claim 13, wherein the submersible target comprises a controller and a timer, and wherein the detection device is automatically activated after a period of time determined by the timer.

15. The submersible target retrieval game method of claim 1, further comprising a covering layer configured around the body portion and having a thickness of 2 mm and a refractive index between 1.08 to 1.58.

16. The submersible target retrieval game method of claim 15, wherein the body portion comprises a hydrogel.

17. The submersible target retrieval game method of claim 15, wherein the body portion comprises deuterium oxide.