Did You Know...
...that while attempting to develop a super strong glue, 3M employee Spencer Silver accidentally developed a glue that was so weak it would barely hold two pieces of paper together? However, his colleague Art Fry needed the glue. Fry sang with his church choir and marked the pages of his hymnal with small scraps of paper that often fell out. He used Silver's glue to hold the papers in place. Today we call this invention Post-it Notes.
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| Number | Title | Issue Date |
| 6729883 | Numeric teaching device The present invention consists of a numeric teaching device having a plurality of spinning wheels mounted on an axle and a decimal point indicator appearing between two groups of spinning wheels, with each spinning wheel containing the digits 0 through 9 printed on ... | 05/04/2004 |
| 5769639 | Multi-educational device A self-corrective, reversible device comprising a handled, slotted framework, on each side of which the top frame is imprinted with inverse mathematical symbols, below which is a number line from one through ten in ascending and descending order. Below th... | 06/23/1998 |
| 5738524 | Multi-function teaching game box A multi-function teaching game box that provides a simple addition and subtraction mathematical calculation for children while playing. Moreover, the structural design of the present invention allows children to comprehend the concept of, and become accus... | 04/14/1998 |
| 4856998 | Teaching aids An improved teaching aid including a plurality of parts, each of the parts having arithmetic indicia printed thereon, the parts being operatively coupled and relatively moveable with respect to each other to vary the location of the arithmetic indicia of ... | 08/15/1989 |
| 4772208 | Apparatus for use in teaching mathematics An apparatus for teaching mathematics which applies and puts to work in various ways the modern teaching of mathematics for all levels of elementary education through set theory, comprises a horizontal board divided into eleven zones and having two outwar... | 09/20/1988 |
| 4585419 | Didactic aid for the teaching of any number system The instant invention relates to an aid for the carrying out of a didactic game in order that any (n) based number system may be learned. It consists of a series of containers decreasing in size, each containing an (n) number of smaller containers which are eq... | 04/29/1986 |
| 4445865 | Method of teaching mathematics A method is provided for teaching and learning multiplication wherein unit power of ten values are assigned to strips of transparent material. The strips are positioned on a multiplication table array over the rows and columns representing the digits of t... | 05/01/1984 |
| 4372742 | Arithmetical teaching aid An arithmetical teaching aid includes a display board B comprising a rectangular array of display areas A arranged in rows R and columns C. Adjacent display areas A are marked (1, 10, 100 etc.) to represent successive powers of an arithmetic base number s... | 02/08/1983 |
| 4331424 | Math educational apparatus An educational device for teaching place values in a base N number system, and regrouping between places. The device has a plurality of workpieces, a support base, partitions on the base to form a plurality of parallel chambers of a length to stack at lea... | 05/25/1982 |
| 4176474 | Visual teaching aid for number concept An educational device for teaching whole numbers to children; the device including a board having horizontal rows of pockets, and each pocket of the rows is identified either as "ones", "tens", "hundreds" etc. in proper sequence, so that cards having nume... | 12/04/1979 |
| 3995378 | Mathematics visual teaching aid A mathematics visual aid particularly useful in teaching subtraction to both slow and fast learners. The apparatus includes in a preferred embodiment form a support structure having a plurality of vertical divider members which define a plurality of worki... | 12/07/1976 |
