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Actor Marlon Brando has four patents, all named "Drumhead tensioning device and method."
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| Number | Title | Issue Date |
| 7722356 | Method and apparatus for the manipulation of fractions using transparencies The invention provides a method and apparatus for operations of addition, subtraction, multiplication, and division of fractions, decimals, percents, proportions and equations. It allows the students to find the transparent area models on their sheets with the corre... | 05/25/2010 |
| 7309233 | System and method of teaching and learning mathematics Numero Cubes and the Whole Number System are disclosed. In one embodiment, the system may comprise cubes, pegs, magnets, dividers, shafts, and a number placement panel. The shafts may comprise individual marks representing the base ten number system. The system may ... | 12/18/2007 |
| 7275290 | Touch fasteners Molded male touch fastener components, and methods of making such components are disclosed. Components include multiple, discrete features that extend laterally from a common side of an upper end of a formation, for engagement of loops. ... | 10/02/2007 |
| 7220126 | Educational mathematics game There is shown card game apparatus and method of play for use in educating children in basic mathematical concepts, the apparatus including a six-sided mathematical function indicator, such as a die, used in combination with two sets of cards, the function generator... | 05/22/2007 |
| 7117131 | Method for characterizing a complex system Disclosed is a computer-implemented method for characterizing a complex system, wherein said complex system consists of a plurality of objects and wherein relations are present between said objects, said method comprising the steps of (a) forming a hierarchical stru... | 10/03/2006 |
| 7104799 | Mathematics teaching tool A mathematics education apparatus comprises a base array. The base array includes a plurality of rows, with each row having ten receiving positions. The mathematics education device further comprises a plurality of number pieces that each correspond to a number, inc... | 09/12/2006 |
| 7097174 | Method and device for playing a game using remainder values The present invention relates to a method of playing a game in which a guess is made of a number value of a remainder. A total point value is determined from game pieces given to a player. A number value of a remainder is determined by dividing the total point value... | 08/29/2006 |
| 7052638 | Hook and loop fastener Forming a fastener component having heads constructed to engage loops formed e.g. of fibers of a mating component, comprises forming, from a thermoformable material, a preform product having a sheet-form base and an array of preform stems integrally molded with and ... | 05/30/2006 |
| 6575755 | Fraction circle A mathematical teaching aid includes a plurality of sectional pieces representing fractions of a circle. The pieces are preferably colored corresponding to respective fractions, wherein fraction pieces having a prime number denominator are of primary colo... | 06/10/2003 |
| 6293800 | Educational and entertainment device An educational and entertainment device includes n layers stackable in a predetermined order one on top of the other to define a tower having n layers. The xth layer, where x varies between 1 and n, is divided into x sections, at least one of the x sectio... | 09/25/2001 |
| 6192594 | Fraction ruler An educational apparatus used for the teaching of mathematical operations that use fractions. A triangular shaped ruler prism has three different side surfaces that are joined together at three common edges with four different numerical value measuring fr... | 02/27/2001 |
| 5679002 | Fractional-arithmetic-teaching game and method for playing An apparatus and a method for playing a math-teaching board game which enables a player student while manipulating game-pieces to gain an understanding of the concept of fractions and arithmetical operations associated therewith. The game is played by 2 t... | 10/21/1997 |
| 5597308 | Assembly including interlocking components for teaching mathematical concepts An assembly for teaching mathematical concepts includes a plurality of interlocking components, each having at least one connecting end so that the components can be combined in any order or length. Each component is assigned a mathematical value accordin... | 01/28/1997 |
| 5470234 | Circular, piece-matching math educational aid A design for a circular, piece-matching math educational aid is disclosed. It contains a holding plate and various fraction pieces. The circular holding plate has a clockwise spiral bottom, designed in such a way that a sloped cliff is formed at the joint... | 11/28/1995 |
| 5192077 | Fraction illustrating polyhedron A polyhedron with indicia carrying sections, for example a cube. The polyhedron is comprised of a first plurality of first larger sections, e.g. two halves of the cube, and the two larger sections are hinged together along neighboring edges. Their abuttin... | 03/09/1993 |
| 5076793 | Fractal mathematics kit A fractal mathematics learning kit includes a plurality of boards each in the shape of an equilateral triangle having defined thereon a pattern of ten smaller equilateral triangles, and a plurality of manipulative elements made of one or more connected eq... | 12/31/1991 |
| 4914019 | Multi-purpose learning device This invention deals with a multi-purpose learning device for mathematics, language, logic reasoning, and classification of objects.... | 04/03/1990 |
| 4778390 | Method and apparatus for teaching fractions The present invention is directed to a method and apparatus for teaching fractions to school age children. The invention provides an instrument having a base with at least two aligned scales of corresponding numerical indicia subdivided into different fra... | 10/18/1988 |
| 4730831 | Game with board, playing pieces and award pieces A playing board with paths thereon, each made up of a series of squares. Playing pieces are moved along the paths, and at certain locations are instructions for picking up award pieces, which are items making up a sandwich, including bread, ham and cheese... | 03/15/1988 |
| 4614042 | Measuring and instructional ruler device A measuring and instructional ruler device is provided for use by children and persons having learning impediments or physical handicaps. The device is comprised of a base panel having one inch subdivisions delineated by both visual indicia and tactile fe... | 09/30/1986 |
| 3996675 | Instructional birthday cake toy An instructional birthday cake toy which has a recreational and educational function for children. The cake comprises various pie-wedge shaped fractional divisions to teach the concepts of fractions by forming various available combinations of pieces. Usi... | 12/14/1976 |
| 3935649 | Multi-purpose mathematical aid A multi-purpose mathematical aid designed to allow students, especially children, to see mathematical relationships by manipulation of materials. In its preferred form the mathematical aid comprises two moulded plates forming two halves of a storage case.... | 02/03/1976 |
