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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 |
| 8123144 | Rail joint bars and rail joint assemblies A rail joint assembly is provided for joining abutting railroad rails with an electrically-insulated joint. The rail joint assembly comprises abutting railroad rails compressing an insulating gasket therebetween and rail joint bars secured through a plurality of hol... | 02/28/2012 |
| 8113441 | Lap joint A lap joint assembly that includes two spaced apart mating railroad end sections that are double bent and machine tapered and trimmed to conform in spatial alignment with one another, an electrical insulating material positioned between the two machined mating rail ... | 02/14/2012 |
| 8042747 | Notched tie plate insulator A notched tie plate insulator adapted to be received within a recessed area of a tie plate of a railroad rail system. The insulator includes a bottom plate having a first side and a second side and a pair of side plates attached to the bottom plate. Each side of the... | 10/25/2011 |
| 7465387 | Coal tar and hydrocarbon mixture pitch and the preparation and use thereof A method of making a carbon/graphite product using a coal tar pitch having a softening point in the range of about 150° C. to 250° C. Also, a carbon/graphite product having a softening point in the range of about 150° C. to 250° C. A method of making mesophase p... | 12/16/2008 |
| 7066997 | Coal tar and hydrocarbon mixture pitch and the preparation and use thereof A method of making the saturated aircraft brake preform using a coal tar pitch having a softening point in the range of about 160° C. to 240° C. Also, a product having natural rubber in the formulation and the method of making the product using a coal tar pitch ha... | 06/27/2006 |
