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Magician Harry Houdini patented a "Diver's Suit" enabling the wearer to "quickly divest himself of the suit while being submerged and to safely escape and reach the surface of the water."
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| Number | Title | Issue Date |
| 4233741 | Map reading device The device has a semi-circular housing 10 defined by a linear wall 14 and an arcuate wall 12, with an inturned edge 13, 15 on one side of the housing. Beta light strips 18 are located in the recess beneath the edges 13, 15 so that graduations on the inter... | 11/18/1980 |
| 4202612 | Arrangement for sensing the geometric characteristics of an object A plurality of projectors are positioned in spaced relationship about an object with a surface to be geometrically analyzed. The projectors have cooperating masks which project onto the object illuminated patterns that subdivide the object into predetermi... | 05/13/1980 |
| 4174675 | Analytical instrument The object of the invention is to provide an analytical instrument (25) for use with profile diagrams (1) of materials to monitor and determine whether the detection systems producing such profile diagrams (1) are functioning properly, and to quickly pin-... | 11/20/1979 |
| 4131998 | Tumor growth measurement device A device for measuring growth of tumors includes concentric rings on a carrier, the radial spacing of the rings from one another progressively increasing in a radially outward direction.... | 01/02/1979 |
| 4127941 | Means and graphical method of calculating moments of inertia This disclosure relates to a means and graphical method of calculating Moments of Inertia which utilizes a specially designed graph paper that simplifies calculation of the Moment of Inertia of an irregular shaped area with respect to a fixed axis.... | 12/05/1978 |
| 4023276 | Diagnostic scale for interpretation of electrocardiogram A diagnostic scale for interpretation of an electrocardiogram composed of a fixed diagnostic scale having formed two sections on the surface thereof, one section displays the interrogation items concerning various parameters of the electrocardiogram, and ... | 05/17/1977 |
| 3984657 | Stock trend indicator A stock trend indicator and method of using is disclosed. The manipulable instrument is used with a standard stock chart to forecast an evaluation of future stock behavior.... | 10/05/1976 |
| 3982323 | Combination interpolator and distance divider A contour interpolator and distance divider comprising an instrument which converts a mathematical operation directly into a graphic solution, including a scale device where there are a plurality of scales extending in parallel relation running in consecu... | 09/28/1976 |
| 3939567 | Method and relevant apparatus for the indirect measurement of the longitudinal development of curved seats or grooves in mechanical workpieces A method and apparatus for the measurement of the distance between two points along a circular arc having an unknown radius in which there is a measuring signal generated responsive to the distance between the two points along a straight line passing thro... | 02/24/1976 |
| 3939568 | Method and apparatus for locating improperly positioned or bent rolls A method and apparatus for locating improperly positioned or bent rolls among a set of rolls which define a confined path of travel for a workpiece, particularly useful for checking a straight or curved roll-rack of a continuous-casting machine. The appar... | 02/24/1976 |
