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| Patents Granted on 1839-04-__ | |||||
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| Number | Date | Patentee | Title | Type | |
| GB-183,908,023 | Apr. 09, 1839 | J. Nasmyth | Bearings of locomotive steam-engines | steam engines | |
| RX-8 | Apr. 18, 1839 | J. Mackay | Improvement in Mode of Fitting the Hammer-Heads of Piano-Fortes | music instrument maker | |
| 1,132 | Apr. 22, 1839 | J. Wetherell | Vise | vises | |
| 1,138 | Apr. 29, 1839 | O.N. May | Machine for planing or dressing sawed shingles | shingle machines | |