After the business license of an enterprise is revoked, its trademark patent is still valid. According to the Trademark Law of People's Republic of China (PRC) and the Patent Law of People's Republic of China (PRC), trademarks and patents are rights that have nothing to do with the qualification of an enterprise as a legal person. As long as the trademark or patent applied for conforms to the law and is not found to violate laws and regulations at the time of application, even if the business license of the enterprise is revoked, the trademark or patent is still valid.
However, it should be noted that the trademark or patent right may become invalid if the enterprise fails to fulfill the relevant obligations during the period when its business license is revoked, such as failing to pay the annual fee or failing to maintain it. In addition, if the trademark or patent right of an enterprise conflicts with the rights and interests of other enterprises, it may also lead to disputes and controversies. Therefore, enterprises should abide by relevant laws and regulations, pay fees in time, and safeguard their trademarks and patent rights.