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| Number | Title | Issue Date |
| 7461459 | Instrument for drawing ellipse or the like A drawing instrument includes a turning assembly including a handle, a post having an end center, a bevel gear rotatable about the post, and a lower extending socket; a gear assembly meshed with the bevel gear and including a wheel; a link assembly including a first... | 12/09/2008 |
| 7010860 | Hand-held cutting device A cutting device is operable with one hand for cutting a circle or an elliptical shape in a sheet of material. In a first embodiment for cutting elliptical shapes, the cutting device includes a first member for placement on the sheet material and a second member for... | 03/14/2006 |
| 6668461 | Hand-held cutting device A cutting device is operable with one hand for cutting a circle or an elliptical shape in a sheet of material. In a first embodiment for cutting elliptical shapes, the cutting device includes a first member for placement on the sheet material and a second... | 12/30/2003 |
| 6484406 | Hand-held cutting devices A cutting device is operable with one hand for cutting a circle or an elliptical shape in a sheet of material. In a first embodiment for cutting elliptical shapes, the cutting device includes a first member for placement on the sheet material and a second... | 11/26/2002 |
| 6374503 | Oval cutter An apparatus for rendering ovals of adjustable sizes and ellipticity upon various materials. An oval cutter comprises a clickerplate for adjusting the ellipticity of ovals in a single movement. The clickerplate can be rotated about a base using a knob mou... | 04/23/2002 |
| 6286216 | Tool for making circular cuts A hand tool for forming circular cutouts of sheet material secures the material so that no generally central penetration in the form of a pilot hole or the like, is required. The resulting cutout is useful in the construction of an article assembled from ... | 09/11/2001 |
| 6158133 | Oval cutter An apparatus for rendering ovals of adjustable sizes and ellipticity upon various materials. An oval cutter comprises a clickerplate for adjusting the ellipticity of ovals in a single movement. The clickerplate can be rotated about a base using a knob mou... | 12/12/2000 |
| 5870830 | Conic section compass Conic Section Compass (CSC) is a hand-held drawing device. It applies a mathematics concept. CSC can be used to draw circles, ellipses, parabolas, hyperbolas or make surface curvatures of these types. Given a specific mathematics formula of the mentioned ... | 02/16/1999 |
| 5233748 | Adjustable oval mat cutter An oval mat cutter allows the continuous adjustment of the overall size of the oval as well as the difference between its larger and smaller axes. The cutter may also produce circles. The cutter separates the knife from a first point which it keeps in a f... | 08/10/1993 |
| 4204327 | Ellipse compass Adjustable compass for drawing on a plane an ellipse of predetermined major and minor axes including a supported guide rod having a lower pointed end and a tracing bar attached to the guide rod through a connection which can rotate about and slide paralle... | 05/27/1980 |
