Patent law is highly complex and drafting patents is among the most difficult of all legal writing.
That's why experts caution that preparing and filing patent applications on your own may result in patents that don't give adequate protection. You can, however, cut your expenses by drafting the patent application yourself and having the attorney proof your final application. Filing fees change yearly. Once a patent is issued, maintenance fees come into effect. It can be filed at lower cost, without claims and with less formality than a conventional patent.