Education and demonstration – Physical education – Developing or testing coordination
Reexamination Certificate
2003-05-12
2004-11-02
Fernstrom, Kurt (Department: 3712)
Education and demonstration
Physical education
Developing or testing coordination
C434S247000
Reexamination Certificate
active
06811403
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates generally to color changing and more specifically to a chemically treated biodegradable material having an image impregnated therein that is only viewable by absorption of uric acid. The image produced on the biodegradable material reacting with urine to become visible is designed to encourage infants to use the potty when having to urinate.
The invention when reacting to water alone reveals a dark outline or sketch of the actual image. This way the child is still encouraged to make the effort to get to the potty. Only when uric acid or urine is detected by the invention will bright and vibrant colors be revealed giving the potty training tot an even greater surprise and even bigger reason for wanting to see the images.
2. Description of the Prior Art
There are other toddler potty training devices. Typical of these is U.S. Pat. No. 456,047 issued to Meyer on Jul. 14, 1891.
Another patent was issued to Guthmann on Aug. 29, 1934 as U.S. Pat. No. 2,083,372. Yet another U.S. Pat. No. 3,725,104 was issued to Fraik, et al., on Apr. 3, 1973 and still yet another was issued on Jul. 17, 1973 to Duskin as U.S. Pat. No. 3,745,672.
Another patent was issued to Sokol et al., on Feb. 12, 1980 as U.S. Pat. No. 4,188,431. Yet another U.S. Pat. No. 4,631,203 was issued to Schaefer et al on Dec. 23, 1986. Another was issued to Walker, Jr. et al., on Nov. 15, 1988 as U.S. Pat. No. 4,784,876 and still yet another was issued on May 21, 1991 to Cellists as U.S. Pat. No. 5,017,226.
Another patent was issued to Kawashima on Jun. 1, 1993 as U.S. Pat. No. 5,215,956. Yet another U.S. Pat. No. 5,310,627 was issued to Hire et al on May 10, 1994. Another was issued to Miller et al., on Apr. 2, 1996 as U.S. Pat. No. 5,503,665
U.S. Pat. No. 456,047
Inventor: Otto Meyer
Issued: Jul. 14, 1891
The process for producing lines, words, and figures on paper or any other suitable material, which consists in drawing, writing, or printing them with solutions of phenolphthalein, coroline, or any other indicator of alkaline reaction and subsequently subjecting the same to the reaction of an alkali to develop the lines m words, or figures, substantially as described.
U.S. Pat. No. 2,083,372
Inventor: Walter S. Guthmann
Issued: Jun. 8, 1937
A sympathetic ink, normally invisible when applies to dry paper of sized or unsized type but adapted to be made visible when the paper is wetted, said ink comprising a material affecting the water permeability of the paper, and a solvent therefor having a vapor pressure between approximately 0.1 and 7.5 millimeters of material constituting on the order of 0.25% to 5% of the
U.S. Pat. No. 3,725,104
Inventor: Robert D. Fraik
Issued: Apr. 3, 1973
The discolored paper-based feedback systems employ thermograph processes which transfer a pattern of vaporized reactant material selected from the group consisting of: dithooxamide, the N,N-distributed derivatives of dithooxamide, and iron-complexing compound having a benzene ring and at least two hydroxyl groups substituted in adjacent positions on said ring to treated or untreated paper-like receptor sheet to form a storable latent image, i.e. a hidden entry, on the sheet. The latent image can be developed weeks or months later with a coreactant salt.
U.S. Pat. No. 3,745,672
Inventor: Robert B. Duskin
Issued: Jul. 17, 1973
Colorless painting apparatus having chemically treated sheets which are provided with a color forming reactant, and a supply of colorless paints each of which chemically reacts with the absorbent color forming reactant of each treated sheet for imparting different colored illustrations upon the sheet.
U.S. Pat. No. 4,188,431
Inventor: Phillip E Sokol et al
Issued: Feb. 12, 1980
This invention relates to alkali developable, paper-based systems printed with invisible phenolphthalein inks and made reusable through many development cycles by employing critical concentrations of dye reactants in conjunction with a paper having a defined water soluble acidity-alkalinity.
U.S. Pat. No. 4,631,203
Inventor: Rolf Schaefe, et al
Issued: Dec. 23, 1986
A sharp imaging, non-smearing system for latent imaging and subsequent visual development of printed text or the like is provided which can be used on a variety of substrates (e.g., paper, metal, cloth, synthetic resins) and is extremely stable and easy to use. The system involves first imaging a substrate with an invisible ink containing a dissociable transition metal salt such as CuSO.sub.4, with subsequent application of a liquid developer containing a solubilized color precursor such as thiooxalic amide which complexes with dissociated transition metal ion to give a sharp, virtually instantaneously developing, long lasting color. Depending upon the metal salt selected, different colors can be obtained upon development. The system of the invention can be used in a variety of contexts, such as in self-testing materials or novelty items.
U.S. Pat. No. 4,784,876
Inventor: Haywood A. Walker Jr. et al
Issued: Nov. 15, 1988
A sharp imaging, non-smearing system for latent imaging and subsequent visual development of printed text or the like is provided which can be used on a variety of substrates (e.g. paper, metal, cloth, synthetic resins) and is extremely stable and easy to use. The system involves first imaging a substrate with an invisible non-blurring, non-sublimating ink containing a dissociable nickel salt such as NiSo.sub.4, with subsequent application of a liquid developer containing a dispersed color precursor such as dimethylglyoxime which reacts with nickel ion to give a sharp, long lasting red color. The developer preferably includes an accelerator such as NaOH for accelerating the above reaction so as to make it virtually instantaneous. The system of the present invention can be used in a variety of contexts, such as in self-testing materials or novelty items.
U.S. Pat. No. 5,017,226
Inventor: Michael Kulisz
Issued: May 21, 1991
Disclosed is a system for developing latent images on alkali-based or acid-based paper stock which has been marked with a water-soluble oxidizing agent to form a concealed image. In the system, a marking composition is applied to said paper stock which comprises (a) A water-soluble iodide, (b) Acetic acid, (c) A water-soluble reducing agent, and (d) Water. Preferably, the reducing agent is ascorbic acid and preferably the marking composition also comprises a water-soluble dye.
U.S. Pat. No. 5,215,956
Inventor: Kiyoharu Kawashima
Issued: Jun. 1, 1993
In the color changing print of this invention, plural areas are printed by using plural types of color changing inks which develop into different colors from the substantially invisible colorless state by reaction with a color changing agent. By the emergence of print from colorlessness and by giving changes in the appearing colors, unexpectedness and entertainingness are provided so that an attractive education may be realized.
U.S. Pat. No. 5,310,627
Inventor: Suzan J. Hirz et al
Issued: May 10, 1994
A method for locally enhancing the contrast of a yellow image, which method comprises providing a yellow image on a white background, said images comprising yellow areas and white areas, said yellow areas and white areas exhibiting pH levels which differ by at least 0.5 in an aqueous environment, applying too at least a portion of a said yellow image a solution of a pH color changing dye which will change color to a color other than yellow when coated on one of said yellow areas or white areas and not change color when coated on the other of said yellow areas or white areas, thereby forming a colored image duplicating the yellow image in areas where the solution has been applied, said colored image having a visually better contrast than said a yellow image.
U.S. Pat. No. 5,503,665
Inventor: Richard E. Miller
Issued: Apr. 2, 1996
A coloring system is provided in which an undercolor composition is applied to a substrate to thereby leave a colorless mark. The undercolor composition is then written over with an overcolor composition,
Fernstrom Kurt
Kroll Michael I
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