Can I get a refund if the patent application is unsuccessful? How come?

Usually, no matter whether the patent application is successful or not, the patent application is non-refundable.

Patent application funding:

1, the examination procedure of the invention patent application:

Application-acceptance, charging-preliminary examination-substantive examination request-substantive request-granting patent right-issuing patent certificate.

2, the application for a patent for utility model review procedures:

Application-acceptance, payment-preliminary examination-granting patent right-issuing patent certificate.

3, design patent application review procedures:

Application-acceptance, payment-preliminary examination-granting patent right-issuing patent certificate.