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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 |
| 7240947 | Compact truck tailgate and general purpose utility ladder An exemplary embodiment sets forth an apparatus, including a non-collapsible single unit stair comprising: a pair of opposing side rails supporting at least a top step and a bottom step; a coupler adapted to couple the apparatus to an edge of a horizontal surface; a... | 07/10/2007 |
| 5775226 | Underwater and land travel vehicle A pair of travel rails (46) each having an upper surface and a lower surface are laid to extend from on the land (44) into the water (45). Main tires (12) are rotatably disposed on opposite sides of a vehicle body (1), so that they are located between the... | 07/07/1998 |
| 5642915 | Roof hatch for large-capacity vehicles such as motor buses A roof hatch for the roof of a vehicle, such as a large capacity vehicle. The roof hatch includes a rectangular shaped outer hatch frame, a rectangular shaped inner hatch frame received at the outer hatch frame, a rectangular hatch cover of glass over the... | 07/01/1997 |
| 5209435 | Passsenger car with emergency exit An elevated passenger car having an emergency exit feature. The passenger car is of the type supported such that there are substantially no obstructions between the underside of the car and the ground below it. The car includes a body having a passenger c... | 05/11/1993 |
| 4785741 | Emergency exit in vehicles, particularly in aircraft and spacecraft An emergency exit in vehicles, particularly aircraft or spacecraft. The vehicle wall defines an emergency exit opening. A door is sealingly placed against and lockable with the vehicle wall. The door can be moved outwardly through the opening for complete... | 11/22/1988 |
| 4690064 | Side-mounted monorail transportation system A monorail beam is provided with a lower, upwardly-facing support surface, a lower, laterally-facing support surface and an upper, medially-facing support surface (relative to the support beam). Vehicles are hangingly supported, pendulum-like, from davit-... | 09/01/1987 |
| 4615275 | Emergency exit apparatus There is provided an emergency exit apparatus disposed on a wall surface of a train car. A hinged door assembly comprises a hinged door portal frame and a hinged door carrying a stair on its inner surface. In one embodiment, the lower edge of the hinged d... | 10/07/1986 |
| 4497512 | Emergency release handle An emergency release handle is pivotally mounted within an interior wall of a railcar and connected to pull a cable under emergency conditions to actuate a mechanism, such as a mechanism to open a door. The handle is normally maintained inside the wall by... | 02/05/1985 |
| 4290368 | Manual and motor actuated railway car door A sliding door for railroad cars which may be manually operable but is also provided with a pneumatic device and a pneumatic control circuit operably connected to the door for closing the door by power operation, which pneumatic device, after effecting po... | 09/22/1981 |
| 4216725 | Combination door and emergency stairway exit A combination end door and emergency stairway unit operates as a conventional rapid transit door to allow movement between cars. The unit also includes an auxiliary door inner frame pivotally mounting a staircase that may be rotated and lowered to the gro... | 08/12/1980 |
