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| Number | Title | Issue Date |
| 5183519 | Method for quenching railway rail heads A method of air quenching a railway rail with an apparatus develops a pearlite microstructure in the head of the longitudinally travelling rail as it travels under the apparatus. A primary air chamber at a controlled pressure provides air to the top and s... | 02/02/1993 |
| 4938460 | Apparatus for air quenching railway heads Air quenching apparatus develops a pearlite microstructure in the head of a longitudinally travelling railroad rail as it travels under the apparatus. A primary air chamber at a controlled pressure provides air to the top and side surfaces of the rail hea... | 07/03/1990 |
