68 Pa.C.S. § 6108: Patents.

(a) Costs.--Upon receipt of an appraisal under section 6107 (relating to appraisals), the department shall notify the applicant and request the amount due the Commonwealth. The expenses incident to the investigation, advertising, survey and appraisal must be paid by the applicant.

(b) Issuance.--The department shall issue a patent to an applicant upon completion of all of the following:

(1) Approval by the department of the material required by section 6103(c)(4) (relating to application).

(2) Payment of the amount under subsection (a). If the applicant does not make payment within three months from the request under subsection (a), the applicant shall be deemed to have abandoned the application, and the department may:

(i) grant a patent to a subsequent applicant upon payment of the amount under subsection (a); or

(ii) if more than one year has elapsed since the receipt of the appraisal, require a current appraisal.

(3) Compliance with law, including regulations promulgated by the department.

(4) Final disposition in the applicant's favor of any entered caveat.

(5) Approval by the Governor.