Did You Know...
...that when IBM conducted a market study of Chester Carlson's invention in 1959, the company concluded that it would take only 5000 units of his new product to saturate the market? IBM therefore declined to be part of the new product introduction. Too bad for IBM. Carlson's invention was the xerography process, and his new product was the beginning of the Xerox Corporation. It is estimated that every day, worldwide, 3,000,000,000 copies are made!!
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| Number | Title | Issue Date |
| 7021539 | Ballot system and method adapted for optical scanning A ballot system including a printed ballot wherein the locations intended for marking voter choices are pre-treated with invisible ink, the remainder of the ballot being untreated; a marking pen containing an activating chemical which makes the invisible ink change ... | 04/04/2006 |
| 6996365 | Scoring method and scoring system A scoring method and a scoring system perform scoring quickly and accurately, and summarize and sort the scores into statistic data readily. The scoring method includes the steps of collecting answer data concerning answers provided by a plurality of examinees in a ... | 02/07/2006 |
| 6879805 | Test form having a removable opaque layer, and method and apparatus for printing on the form A test form comprises a substrate, a chromogenic material applied to at least a top surface portion of the substrate, a removable opaque layer overlaying a portion of the chromogenic material, the chromogenic material being adapted to irreversibly generate a visible... | 04/12/2005 |
| 6152449 | Combined sticker and invisible ink game An association game including an overall image a portion of which is in latent invisible form to be developed by a marking means to provide an identifying configuration for a visible portion movably compatible with the latent image developed portion.... | 11/28/2000 |
| 5217231 | Power of observation invisible ink game A power of observation game including two sets of visible images with each set including visible images substantially corresponding and with a preselected portion of at least one corresponding image of one set of visible images being visibly incomplete wi... | 06/08/1993 |
| 5188871 | Authenticatable security paper A security paper authenticating system comprises, in combination, a security paper carrying both starch and an iodate salt, typically potassium iodate, and an authenticating composition comprising an acidic solution of an iodide salt, typically potassium ... | 02/23/1993 |
| 5160266 | Mix and match invisible ink game A learning association game wherein at least two series of images are visibly presented on at least one marking sheet with each of the images of one series being logically related to one of the images of the other series and with the images of each series... | 11/03/1992 |
| 5011445 | Color memory toy set A color memory toy set has a color memory toy with surface, at least one portion of the surface being provided with a color memory temperature-sensitive color changing layer colored with a coloring material including a color memory temperature-sensitive d... | 04/30/1991 |
| 4787852 | Multicolor interactive notepad A kit for producng symbols of unpredictable colors on paper including a plurality of individual sheets of paper each having a coating therein containing a reactant composition. A writing instrument is included in the kit to be usable with the various pape... | 11/29/1988 |
| 4781595 | Visual design and character formation composite A composite sheet for forming visually observable designs comprising a transparent deformable upper layer having a plurality of pockets formed therein; a transparent intermediate layer sealed to the upper layer along edges of the pockets to form a plurali... | 11/01/1988 |
| 4744113 | Toilet training aid and method A toilet training aid comprising a porous sheet of papers having a normally invisible picture imprinted thereon is attached to the rim of a toilet bowl over the mouth thereof whereby the attention of a child is attracted to use the toilet as the picture b... | 05/17/1988 |
| 4702497 | Method of encoding a symbol or message on a plastic material and an article on which a symbol has been so encoded The method includes the steps of inscribing or imprinting a symbol or message on a substantially flat surface of a block of plastic while the same is at an elevated temperature by the application of pressure to said surface. The plastic block is then cool... | 10/27/1987 |
| 4631203 | Latent imaging and developer system 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 t... | 12/23/1986 |
| 4514177 | Invisible ink quiz game A game device including first and second areas with the first area having a number of visible questions, each having a visible identifying indicia associated therewith and at least two visible answers with invisibly marked designations indicating correctn... | 04/30/1985 |
| 4360548 | Self-contained covert image A hidden image, which can be made detectable by rubbing, is produced by applying to a substrate surface a first ink-like material in image configuration, then applying a second ink-like material to cover the image and an area surrounding the image. Each o... | 11/23/1982 |
| 4337051 | Self-scoring test with non-disclosed key A scoring form for tests having a series of questions with multi-choice answers. The form provides an answer group for each question. An answer group is a matrix of rows and columns. The number of columns (or matrix elements in a row) is typically equal t... | 06/29/1982 |
| 4198445 | Latent image printing and development This invention relates to materials and methods used in informational, testing, educational, amusement and other paper-based feedback systems embodying invisible images comprising a color-forming reactant material which can be rendered temporarily visible... | 04/15/1980 |
| 4188431 | Latent image printing and development 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 defi... | 02/12/1980 |
| 4139965 | Device using coated paper and chemical reactive marker In a device using an impregnated paper with a chemically reactive marker, the device includes a box-like housing having a translucent planar surface with light projected from within the box onto the rear side of the surface. A paper impregnated with an in... | 02/20/1979 |
| 4111462 | Latent, sensitizing ink Latent, sensitizing inks for application to selected areas of substrates by conventional printing methods. The inks comprise a unique vehicle component which is a nonpolymeric, oleophilic, organic Arrhenius acid anion having a cationic counter-ion and, in... | 09/05/1978 |
| 4084332 | System for visual communication A system for visual communication, the system being particularly useful in designing and producing games, puzzles, autocorrective tests, programed teaching materials, coloring sets or sheets, graphic arts supplies and various other educational, game and a... | 04/18/1978 |
| 4051283 | Printed sheets containing concealed images and method and materials for preparation and visual development of same A system for the preparing of copy containing concealed images and a marking material for the development of same in which the components comprise a receiving material in the form of starch or polyvinyl alcohol, an iodide which is oxidizable to iodine, an... | 09/27/1977 |
| 4038761 | Element and method for teaching with liquid crystals An element for use as a teaching, examination and instructional material formed of a sheet having a visible image imprinted thereon and coded images keyed to the visible image in which the coded images are formed with a material, such as liquid crystals, ... | 08/02/1977 |
| 4028118 | Thermochromic materials An excellent thermochromic material exhibiting a sharp and reversible metachromatism at temperatures within a range of from -40° to 80° C can be formed from (A) an electron-donating, chromatic organic compound; (B) a compound containing a phenolic hydro... | 06/07/1977 |
| 3990156 | Constructed response method with invisible answer indicator to prevent cheating A device for teaching includes a work sheet having a number of sets of response regions. Each response region is comprised of at least one answer area and at least one confirmation area. Invisibly printed answers are generally provided within the confirma... | 11/09/1976 |
| 3979550 | Pre-printed latent image spirit duplicating masters A pre-printed spirit duplicating master containing visible imaged material and latent imaged material for use in preparing copies for self-instructional examination or work assignments. The latent images on the copy sheet are capable of being revealed wit... | 09/07/1976 |
