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Thomas Edison obtained a patent for an electrographic vote recorder.
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| Number | Title | Issue Date |
| 7516519 | Door or gate closing hinge The adjustable self-closing hinge (1) comprises a first hinge part (2), a second hinge part (3), a hinge shaft (10), a torsion spring (18) having a first end (19) fixed with respect to the first hinge part (2) and a s... | 04/14/2009 |
| 7207542 | Mounting system with wedge A mount for securing an associated object such as a sign to a supporting structure having wall defining an opening therein and having an outer surface and an inner surface, includes a mounting element adapted to receive the object. The mounting element has a body ha... | 04/24/2007 |
| 7155779 | Automatic lift and turn hinge and gate An automatic hinge having an upper or left hand section with an arcuate interior or lower edge, a central section with an arcuate left hand or upper edge and an arcuate right hand or lower edge, and a lower or right hand section with an upper or interior edge. The s... | 01/02/2007 |
| 7124993 | Rotating sign mount with automatic return A system for mounting a sign or graphic display to a structure allows rotation of the graphic display and provides for automatic return to the initial orientation. ... | 10/24/2006 |
| 7000289 | Gravity hinge A gravity hinge is disclosed that is simple to manufacture and avoids limitations found in known gravity hinges. The hinge includes two cylindrical knuckles joined by a spindle and separated by a polymer bushing. The junction of the knuckles and the bushing is at an... | 02/21/2006 |
| 4991259 | Butt mounted riser hinge A butt mounted riser hinge has a plastic cam assembly mounted in two metallic cylinders so that their camming surfaces do not rub against the metallic cylinders and become readily worn. The cam assembly includes a male member with bevelled end that is rot... | 02/12/1991 |
| 4391020 | Gravity return hinge having an axle rod in an axle sleeve An automatic return hinge having a primary and a secondary hinge, the primary hinge being furnished with an axle rod with spiral grooves, three locating balls in an axle sleeve roll along the spiral grooves on the axle rod as the door is opened and closed... | 07/05/1983 |
