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...that after Walter Hunt patented the safety pin in 1849, he sold the rights to it for $400?
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| Number | Title | Issue Date |
| 7028488 | Method and apparatus to minimize fractionation of fluid blend during transfer A method of dispensing a liquid material from a source container which includes a blend of fluids of a first composition that normally fractionate upon boiling. A material of a second composition (different than that of the first composition) and capable of maintain... | 04/18/2006 |
| 5862946 | Gas dissolution under pressure The present invention is directed to precise, accurate mixing two or more chemicals in a metered vessel to achieve a precise, accurate concentration of the chemicals. More particularly, the chemicals are mixed in a vessel having constricted vent tubes wit... | 01/26/1999 |
| 5647392 | Air regulation system for hydropneumatic reservoir An air regulation system for a hydropneumatic reservoir of a hydraulic conduit includes a chamber, a water filling device for the chamber, a water emptying device for the chamber, an automatic air introduction device for introduction of air in the chamber... | 07/15/1997 |
| 5205316 | Air/water volume control system Apparatus is described for controlling the volumes of water and headspace air in a water storage/delivery tank of an individual water well system that includes a pump for maintaining water within the storage/delivery tank and for maintaining the pressure ... | 04/27/1993 |
| 4659291 | Hydroelectric switch for controlling electric motor driven pump A hydroelectric switch for a pump comprising in a first embodiment an elongated body defining fluid inlet and fluid outlet orifices, a substantially elongated seat through which fluid flows, a disk having a tapered flange and a rod extending centrally the... | 04/21/1987 |
| 3991783 | System for rapidly building an air cushion over liquid in a tank A system for rapidly building an air cushion over liquid in a tank, without requiring an air compressor for this purpose. During normal operation the air cushion over the liquid is maintained at a given magnitude and pressure by cyclical operation of an a... | 11/16/1976 |
| 3964479 | Extracorporeal blood circulation system and drip chamber with adjustable blood level In accordance with the invention there is provided an extracorporeal blood circulation system including a drip chamber having a blood inlet in its top and a blood outlet in its bottom, such chamber during operation containing blood in its bottom portion a... | 06/22/1976 |
