Methyldopa patent date?

There isn’t a single “the methyldopa patent date.” Methyldopa (alpha-methyldopa) was developed in the late 1950s and there were multiple patent families (covering synthesis, formulations, and medical use) filed and granted in the late 1950s to early 1960s. So the exact date depends on which patent family and jurisdiction you mean.

If you want the precise grant dates:
- Tell me the jurisdiction (US, Europe, etc.) and whether you want the earliest patent covering the compound itself or its use/ formulations.
- I can then look up the exact patent numbers and grant dates (e.g., earliest US patent, earliest European patent, etc.).