Did You Know...
...that power steering was invented by independent inventor Francis W. Davis? As chief engineer in the 1920s of the truck division of the Pierce Arrow Motor Car Company, he saw how hard it was to steer heavy vehicles. So that he would be able to keep the profits from his future invention, Davis left his job, rented a small engineering shop in Waltham, Mass., and developed a hydraulic power steering system that led to power steering.
PatentStorm News
Make the Most of Our Site
See this month's Top Inventors and Most Cited Patents.
Stay on top of the latest innovations by subscribing to an RSS feed.
Registered users: Manage your profile.
| Number | Title | Issue Date |
| 6582234 | Method for demonstrating the inverse square law and apparatus therefor The invention is an educational demonstration designed to help students better understand the concepts of torque and the inverse square law. A variable torque pulley consists of a rigid overlapping spiral shape member and a rigid circular member. The circ... | 06/24/2003 |
| 6213779 | Conic section activity boards The present invention provides a variety of laminated plastic activity boards that allow the individual to visualize and have interactive exploration of conic sections and their definitions. This allows for more class time to be spent investigating the co... | 04/10/2001 |
| 6132217 | Method and apparatus for teaching relationship of trigonometric functions between unit circle and rectangular coordinate system A method and apparatus for teaching a relationship of trigonometric functions between a unit circle and a rectangular coordinate system has a primary flexible member movable between a circular configuration defining the unit circle, and a straight configu... | 10/17/2000 |
| 5775015 | Location recorder process and assembly The location recorder assembly consists of a pair of disks, each bearing location site information about their periphery. The disks are held together by a pair of indicator studs, the heads of which are independently rotatable and which bear designation d... | 07/07/1998 |
| 5281145 | Pictorial image transforming manipulatives The pictorial image transforming manipulatives are instructional visual aid devices adapted for use to demonstrate visually the applications of deductive reasoning in proving most of the geometry theorems in conjunction with a geometry course. The manipul... | 01/25/1994 |
| 5205747 | Bead calculator educational toy An educational toy useable to teach elementary mathematics to children includes a spaced series of mutually aligned parallel rods secured in a side-by-side relationship at their opposite ends to a base portion of the toy. Series of counting beads are capt... | 04/27/1993 |
| 5114347 | Mathematical function demonstrator boards An electromechanical demonstrator board of one or more of the six trigonometric functions. The board is powered electrically by a battery and mechanically by a hand crank which drives a pointer and contact arm. The circuits include light emitting diodes (... | 05/19/1992 |
| 4920033 | Rotatable disk teaching apparatus A demonstrative teaching apparatus for teaching the relationship between variable pictorial and/or graphic displays and their respective numerical values, in which the entire apparatus is positioned within an apparatus housing. The apparatus housing incor... | 04/24/1990 |
| 4705478 | Superimposed transparencies used in education A visual aid in which a background sheet, FIG. 1, features a diagram. It is desired to demonstrate that one part of the diagram, in this case the angle ACD can fit exactly on another part, in this case the angle ABC. The two parts are jointly used as the ... | 11/10/1987 |
| 4676754 | Visual aid for teaching linear relationships FIG. 5 shows a background sheet A featuring the axes X and Y. A transparent strip E is pivotally assembled to A at the pivot point O. A transparent flat tube F is slidable on E. A straight line D is drawn on E and F through O. An operating button G is att... | 06/30/1987 |
| 4461480 | Educational entertainment device comprising cubes formed of four 1/8th octahedron sections rotatably coupled to a tetrahedron An educational entertainment device includes at least one cube formed from (a) a regular tetrahedron and (b) four 1/8th sections of a regular octahedron wherein the faces of the tetrahedron and the faces of the octahedron are all congruent. The 1/8th sect... | 07/24/1984 |
| 4435162 | Trigonometry visualizers and method of making same A transparent face plate has inscribed thereon a first circle surrounded by graduations which divide it into zero through 360°. Two lines of transparency, which are denoted sine and cosine, respectively, intersect at right angles at the center of the cir... | 03/06/1984 |
