The final plat approval shall be filed by the subdivider with the County Recording Officer within 95 days from the date of such approval. If any final plat is not filed within that period, the approval shall expire. For good cause, the Planning Board may extend the time for the filing of the plat for an additional period not to exceed 95 days. No plat shall be accepted for filing by the County Clerk unless it has been duly approved by the Township Planning Board and signed by its Chairman and Secretary.