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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 |
| 5920328 | Method for controlling position of a recording pen A simple and inexpensive device to record one or more phenomena, employing the transmission and receiving of light as a method of sensing pen position. A pen holder (13) is mounted on a pen block (12), as is a light receiver element (15), and pen block (1... | 07/06/1999 |
| 5764244 | Arrangement for positioning a pen in a recording device The present invention is embodied as an arrangement for positioning a pen in a device that records the time profile of a measurement signal which can be connected to the device. The arrangement provides high mapping accuracy of the measurement signal onto... | 06/09/1998 |
| 4348683 | Chart recording apparatus Chart recording apparatus for use with industrial instrumentation systems and the like, and comprising memory means to maintain a signal level for long time periods without drift. An input signal level is translated into the positioning of a pen, through ... | 09/07/1982 |
| 4310841 | Signal handling apparatus Signal-processing apparatus for use with industrial instrumentation systems and the like, and comprising a memory to maintain a signal level for long time periods without drift. An input signal level is translated into the positioning of a movable member,... | 01/12/1982 |
| 4136306 | Apparatus for preparing pattern control tapes Apparatus is provided for digitizing a pattern by utilizing the computer controller and motor driver of an x-y table used in an automatic sewing machine. A manually operated control stick is installed on the machine and connected through the controller to... | 01/23/1979 |
| 4011510 | Signal-responsive apparatus having magnetic-particle-friction memory Signal-processing apparatus for use with industrial instrumentation systems and the like, and comprising memory means to maintain a signal level for long time periods without drift. An input signal level is translated into the positioning of a movable mem... | 03/08/1977 |
| 3982165 | Apparatus for digitizing and plotting An apparatus capable of digitizing or plotting coordinate locations and lines utilizes an automatically controlled carriage that is translated over the supporting surface of a digitizing and plotting table and a free cursor for identifying specific coordi... | 09/21/1976 |
