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| Number | Title | Issue Date |
| 7285380 | Methods of producing polyketide synthase mutants and compositions and uses thereof The present invention comprises crystalline polyketide synthases, isolated non-native polyketide synthases having the structural coordinates of said crystalline polyketide synthases, and nucleic acids encoding such non-native polyketide synthases. Also disclosed are... | 10/23/2007 |
| 7021939 | System and method for determining area of irregular or complex shapes A system and method for determining area of irregular or complex shapes for easily determining area of complex shapes. The system and method for determining area of irregular or complex shapes includes comprises a quantity of tracing paper for capturing a two dimens... | 04/04/2006 |
| 6974327 | Double imputation scale An educational device to teach the biblical doctrine of double imputation is disclosed. The educational device is generally comprised of a cross, a balance type scale, and at least three different objects which by casual observation are of unequal mass. ... | 12/13/2005 |
| 6739875 | Teach-aiding weight set A teach-aiding weight set includes a white, a red, a light green, a purple, a yellow, a green, a black, a brown, a blue, and an orange weight. Each of the weights is provided with spaced shallow grooves to show a plurality of equal sections corresponding to a specif... | 05/25/2004 |
| 6390821 | Engineered protein kinases which can utilize modified nucleotide triphosphate substrates Engineered protein kinases which can utilize modified nucleotide triphosphate substrates that are not as readily utilized by the wild-type forms of those enzymes, and methods of making and using them. Modified nucleotide triphosphate substrates and method... | 05/21/2002 |
| 6200140 | Double-beam math balance The teaching aid apparatus provides two balance beams (27, 28), one above the other, on a support post (23). Weight-attachment stations (36) are provided on the left and right arms of both beams, and the stations are marked on the beams with numerals indi... | 03/13/2001 |
| 5951406 | Adjustable see-saw apparatus The seesaw device is adjustable as to the lengths of the moment arms on the beam, of the two seats. Children can adjust the moment-arm length of their own seat in order to compensate for weight imbalances between them. A visible display scale informs of t... | 09/14/1999 |
| 5927989 | Four-pan algebra balance having an imbalance correction mechanism A four-pan algebra balance includes an imbalance correction mechanism for maintaining a balance beam in a horizontal equilibrium position unless the imbalance between the two sides of the device exceeds a predetermined amount. The balance includes a base,... | 07/27/1999 |
| 5425643 | Mechanical, analog type, teaching aid computer A teaching aid computer, requiring no electrical or spring power, designed for elementary and middle school students, that when properly set and manipulated, provides real number solutions to equations involving multiple degree, as well as single degree u... | 06/20/1995 |
| 4871314 | Toy balance concept-developing device A toy balance concept-developing device for helping children to develop a concept of balance, including a housing, a beam, a positioning means, a model and a number of plastic weights. Owing to the weight difference between the weight on two distal end of... | 10/03/1989 |
| 4733887 | Secure financial document A financial instrument has an amount printed on its face in which the digits making up the amount are printed in a negative pattern. The digits are formed by a series of rows of printed dots which define the outlines of the digits. To make alteration of t... | 03/29/1988 |
| 4731022 | Teaching arithmetic principles A balance for teaching arithmetic principles has a balance arm pivotal about a central horizontal pivot axis coincident with the axis of a support rod supported in openings at the top of opposed vertical upstanding members of a support. The balance arm ha... | 03/15/1988 |
| 4240213 | Educational amusement device for matching words with non-verbal symbols The present educational amusement device includes a horizontally pivoted balance arm and several pairs of matched game pieces. The game pieces of each pair include one which displays a non-verbal symbol and another one which displays the word for that sym... | 12/23/1980 |
| 4218835 | Animal scale toy A toy balancing scale used to teach children the proper relationship between the number of objects and/or the value of numbers, has a base having an upstanding support and pivoted on the support is a horizontal balance bar. At each end of the balance bar ... | 08/26/1980 |
| 4106220 | Mathematical teaching aid A balance beam teaching aid illustrates and verifies mathematical operations involving both integer and non-integer numbers. The balance beam includes a base, a balance arm having a center of gravity and graduations disposed on a face at predetermined lon... | 08/15/1978 |
| 3949491 | Mathematical teaching aid This invention relates to a mathematical teaching aid comprising a beam which has two parallel longitudinal upper faces each face being divided up by equally spaced marks representing numbers, the numbers on one face progressing from 0 at one end to n at ... | 04/13/1976 |
