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| Number | Title | Issue Date |
| 7052279 | Ten-frame subtraction system A ten-frame subtraction system for teaching subtraction skills of the present invention preferably includes at least one card and at least one tile. The card has a positive numerical representation thereon represented by a corresponding quantity of graphical represe... | 05/30/2006 |
| 6217074 | Method and system for generating, storing and managing records A method and system for generating, inventorying, storing and managing records and record forms is disclosed. The record management system and method utilizes a system record generator which generates a plurality of policies, record forms and the like in ... | 04/17/2001 |
| 4903990 | Problem sheet for self-evaluated mathematics examination A printed sheet of paper that is useful as a self-evaluated mathematics test is disclosed. The sheet has inscribed thereon an arrangement of the numerals that represent first and second cardinal numbers. The numerals are so positioned as to indicate a mat... | 02/27/1990 |
| 4537111 | System for aiding note transpositions for stringed instruments A note aid transposer for guitars and other instruments has a plurality of independent slides in a frame holding them parallel; each slide represents a separate string of an instrument; parallel with the slides but at the top of the frame a numbered fret ... | 08/27/1985 |
| 4419081 | Mathematical teaching/learning aid and method of use A mathematical teaching/learning aid includes a set of thin mathematical cards or blocks, the set including six different types of blocks that represent the numbers +1, -1, +X, -X, +X2, and -X2, respectively. A plurality of blocks of... | 12/06/1983 |
| 4369358 | Table correlating device for scuba divers An apparatus used to correlate and selectively read information from tables dealing with the extent of nitrogen absorption in a scuba diver's body. Tables containing information relating to the amount of time a diver spends at various depths, decompressio... | 01/18/1983 |
| 4369359 | Apparatus and method for calculating break-even point of enterprise The break-even point of any enterprise is quickly calculated on a Cartesian coordinate system for plotting receipts versus costs by entering in the coordinate system the fixed costs, and pivoting a cursor to extend from the origin of the coordinate on rec... | 01/18/1983 |
| 4283872 | Adjustable display device An adjustable display device consisting of two or more members, for displaying relevant information when these members have been moved in specific relationships to each other. Both the relative movement and the maintenance of the specific relationships ar... | 08/18/1981 |
| 4251093 | Restaurant checks A restaurant check and method for recording and totalling itemized food costs comprising a sheet for receiving indicia having an operative format of separately delineated digit columns and a stepwise array of cell groups aligned below the vertical columns... | 02/17/1981 |
| 4221326 | Calculator for comparative product investment recovery A calculator having six discs concentrically mounted for relative rotation having scales and indices which are graduated and are selectively registrable. The calculator is operable to determine the period, in years, to recover the higher price of a higher... | 09/09/1980 |
| 4144446 | Biorhythm calculator A biorhythm calculator comprising at least two members, a rhythm scale member and a key scale member. The rhythm scale member has a major surface having a biorhythm cycle thereon, the cycle being identified by numbers of the days of the cycle, with the nu... | 03/13/1979 |
| 4120186 | Multi-die/block drawing machines This invention relates to a method of determining the sequence of die sizes to be used in a multi-die/block drawing machine to draw metal from any given input stock size to any given final wire size to give optimum efficiency and proposes nomograms for ac... | 10/17/1978 |
| 4035616 | Device for the joint evaluation of several cyclic processes Several transparent elements showing periodically-varying curves and a transparent element showing a date scale are superposed over each other and a ground element which shows a number of year scales of different length, subdivided from 0 to 100 years. Th... | 07/12/1977 |
