Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_name_21 (plant_patent_number VARCHAR)
### Question:
What's the patent number of Fukuda?
### Answer:
SELECT plant_patent_number FROM table_name_21 WHERE "inventor" = "fukuda"