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| Patents Granted on 1798-05-?? | |||||
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| Number | Date | Patentee | Title | Type | |
| GB-179,802,231 | May 01, 1798 | T. Rowntree | Heating boilers for engines | stationary boilers | |
| GB-179,802,232 | May 03, 1798 | J. Bramah | Improvement in locks for doors, cabinets, &c. | door and window hardware | |
| 209X | May 18, 1798 | I. Lazell | Machine for Removing Rocks, etc. | stoneworking | |
| 210X | May 31, 1798 | N.J. Roosevelt, J. Smallman | Double Steam Engine | steam engines | |