How much does it cost to write a patent specification for an invention patent?

Acting for an invention patent, our hospital generally charges an agency fee of 4000 yuan. The agency fee of 4000 yuan is not only to write a patent specification, but also to represent all the agency service fees in the whole process of your invention patent, that is, from application to obtaining a certificate, we don't charge any service fees. Of course, no matter what the official fee is, we just pay it. Of course, 4000 yuan also includes the novelty retrieval fee. Before applying, the agency will generally help you search whether the patent is novel or not, and then tell you the probability of successful application. Patent application documents include patent claims, specifications, drawings and other documents, and it is impossible to write only one of them for you. And such a patent, many people with different professional levels work together, and the effect is definitely neither fish nor fowl.