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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 |
| 7779690 | Vibrating wire sensor using spectral analysis Systems and methods for analyzing the resonant frequency of vibratory wires within vibratory wire gauges. The resonant frequency of the vibrating wire is determined by using an interface that digitizes the response of an excited wire in the gauge. A transform then c... | 08/24/2010 |
| 5244177 | Hanger for suspending equipment in a storage tank A hanger for suspending equipment within an existing liquid storage tank includes a longitudinal channel having one end adapted to be fixed adjacent to the upper end of a receiving riser pipe and a second end adapted to project within the tank. A parallel... | 09/14/1993 |
| 5121340 | Multi-level probe and system for measurement of physical conditions in liquid-containing tanks A multi-level probe for sonic range measurements utilizes a plurality of parallel reflectors that each include an opening arranged coaxially about a beam of ultrasonic energy transmitted along a reference axis from an associated transducer. The opening in... | 06/09/1992 |
| 4526034 | Krypton hygrometer An improved spectroscopic hygrometer includes a krypton-filled source tube that produces emissions at 123.58 nm for selective absorption by water vapor in a gaseous sample. The method for measuring water vapor density requires generation of ultraviolet ra... | 07/02/1985 |
