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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 |
| 4465235 | Fire-fighting nozzle with selective flush control mechanism A constant pressure nozzle having a pressure-responsive baffle head movable toward and away from a throat element so as to define a discharge orifice. The throat being movably mounted for retraction by external control means to a debris-flushing position,... | 08/14/1984 |
| 4385727 | Irrigation emitter tube An irrigation emitter tube having, when free of pressure a pair of wall portions, one wall portion being essentially flat between its margins, the other also being essentially flat except for an outwardly arched longitudinally extending portion, the later... | 05/31/1983 |
| 4272022 | Showerhead with replaceable housing A showerhead which provides for a reduced flow volume through the showerhead includes a replaceable decorative cover. The showerhead has a skirt housing (24) which is swivelably mounted on a ball joint (10) connected to a water supply pipe. A generally cy... | 06/09/1981 |
| 4269355 | Self-cleaning spray nozzle A self-cleaning spray nozzle or tip is provided for spray guns and like devices which are adapted to hydraulically atomize and spray liquids such as paint. The spray nozzle includes a valve stem in the spray opening and forming a part thereof which is abr... | 05/26/1981 |
| 4173309 | Flow control devices particularly useful for drip irrigation Fluid flow control devices are described particularly useful as drip irrigation emitters provided with flow regulation to reduce their pressure-sensitivity, thereby enabling them to be used in long lines and in undulating terrain. The disclosed devices in... | 11/06/1979 |
| 4077570 | Penetrably mounted emitter for conduits A miniaturized emitter, penetrably mounted within the wall of a conduit having a fluid to be dispensed, emits a constant volume output flow irrespective of changes in fluid pressure within the conduit. An annular flange laterally biased by an inscribed an... | 03/07/1978 |
| 4077571 | Fluid flow regulator A non-clogging regulator controls the rate of fluid flow from within a fluid conveying conduit regardless of pressure variations within the conduit and irrespective of the presence of particulate matter within the fluid.... | 03/07/1978 |
| 4058257 | Irrigation emitter An irrigation emitter including a fixed longitudinally extending passage wall element having a longitudinally extending restricted flow groove therein, and a flexible longitudinally extending passage wall element overlying the fixed wall element and conta... | 11/15/1977 |
| 3993248 | Fluid flow regulator A non-clogging regulator controls the rate of fluid flow from within a fluid conveying conduit regardless of pressure variations within the conduit and irrespective of the presence of particulate matter within the fluid.... | 11/23/1976 |
| 3979064 | Shower head A shower head is disclosed for regulating water flow. Improvements enable a constant shower spray to be produced even though changes may occur in the pressure in the main lines. According to the invention, this is brought about by arranging outlet holes o... | 09/07/1976 |
| 3970251 | Pipe insertable emitter for irrigation systems An emitter insertable through the wall of a water pipe having a pair of striated skirts depending from opposed edges of the emitter outlet for irrigating soil at a constant rate of water flow despite variations in water pressure within the water pipe.... | 07/20/1976 |
| 3968930 | Drip irrigation device A drip irrigation device comprising a connector for two lengths of hose which includes a flow restrictor for emitting a drip for use in irrigation. The device includes a core member having a central through passageway and an outer helical rib or thread pr... | 07/13/1976 |
