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In 1608, Dutch eyeglass maker Hans Lipperhey filed the first patent for a working telescope. The patent was denied.
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| Number | Title | Issue Date |
| 7513191 | Piston head for hydraulic injection molding machine A piston head of a hydraulic injection molding machine is screwed with a tie rod inside a hydraulic cylinder of the hydraulic injection molding machine. The piston head has a second screw formed in an inner circumference of a hollow of the piston head and engaged wi... | 04/07/2009 |
| 7305916 | Reciprocating-piston machine for motor vehicles A piston compressor has a cylinder including a traveling piston sealed therein. A drive motor acts on a crankshaft, a drive shaft thereof being received by a bore of the crankshaft. A connecting rod provides for articulated connection of a crankshaft-journal of the ... | 12/11/2007 |
| 5794514 | Volumetric machine with curved liners Apparatus is disclosed for articulating and correcting the trajectory of a piston in a volumetric machine with a plurality of pistons in a plurality of corresponding curved cylinders. The apparatus includes a piston seal ring positioned in a plane incline... | 08/18/1998 |
| 5564993 | Continously-variable-ratio transmission of the toroidal-race rolling-traction type A roller-control unit for a continuously-variable-ratio transmission of the toroidal-race rolling-traction type, in which the roller carriage (10, 14) is connected by a pivotal joint (30) to the piston (15) of a hydraulic piston-and-cylinder unit (15, 16)... | 10/15/1996 |
| 4802382 | Connecting rod assemblies intended for the reciprocating driving of a piston inside a cylinder A connecting rod for reciprocally driving a piston within a cylinder wherein the piston rod includes upper and lower portions which are connected by an area of thinner dimension which is also yieldable so as to permit the lower end of the connecting rod t... | 02/07/1989 |
| 4142500 | Two-stroke engine and direct thrust piston A cylinder with cross inlet and exhaust ports contains a combination piston and rod having on its piston end a piston head or face and slidably attached sealing sleeve, and its other end is rotatable via a rod bearing attached to a crankshaft. The rotatio... | 03/06/1979 |
| 4089253 | Linear fluid motor A fluid operated linear motor of the piston and cylinder type. The piston is secured to a rod by a threaded connection and the mating threads are proportioned and dimensioned so that pivotal movement available in the threaded connection is enough to compe... | 05/16/1978 |
| 4034650 | Axial piston type machine An axial piston machine has a cylinder barrel mounted on a shaft and rotatable with respect to a portion of the casing. Between the cylinder block and the casing portion is a disc. The side of the disc adjacent the casing portion is concave and abutting c... | 07/12/1977 |
