Goods or services that meet any of the following circumstances may be purchased from a single source in accordance with this Law:
(a) Can only be purchased from a single supplier;
(2) Unable to purchase from other suppliers due to unforeseen emergencies;
(3) It is necessary to ensure the consistency of the original procurement items or supporting services, and it is necessary to continue to purchase from the original suppliers, and the total amount of additional funds shall not exceed 10% of the original contract purchase amount.
According to the above definition, if the "patented product" you mentioned in my concept refers to a technology patent, and the ownership and use right of the patented product have not been sold or transferred, that is to say, the requirement of "only purchasing from a single supplier" must be met, then the government can purchase from its single source.
I hope I can help you. Thank you.