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Thomas Edison ; 1889
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| Number | Title | Issue Date |
| 7204430 | Tie suitable for use on a track A railroad track tie comprises a body formed at least partially of polymeric material, and a reinforcement totally encapsulated within the body, wherein there is at least one opening through the reinforcement with polymeric material therein. ... | 04/17/2007 |
| 4106696 | Sleeper of steel or similar material A sleeper for receiving and securing a pair of railway rails has openings for receiving the rails for screw-less mounting. Either one or both flanges of the rail foot is secured in the opening by cooperation with a lug of the sleeper. The lug or lugs may ... | 08/15/1978 |
| 4083491 | Synthetic railroad crosstie A railroad crosstie is constructed from at least two individually distinct rail support blocks interconnected by a web system which is fastened to the blocks and which comprises at least one self-supporting rigid sheet member adapted to be buried in the r... | 04/11/1978 |
| 4034913 | Composite railroad tie An improved railroad tie constructed of a metal sheath with angled walls braced longitudinally, vertically, and laterally and reinforced by a filling of concrete, the sheath structure being especially adapted for spring-type rail securing devices bridging... | 07/12/1977 |
