Can I fax in my patent application?

No, you can not fax in your patent application.  Fax machines do not currently produce a document of sufficient quality to allow the text to be scanned and processed for publication purposes.  Applications may, however, be filed through the Electronic Filing System (EFS). For additional information on EFS, contact the Electronic Business Center at (866) 217-9197 (toll free) or (703) 305-3028. For additional information regarding filing patent applications, you may contact the USPTO Contact Center (UCC) and request to be transferred to the Inventors Assistance Center (IAC). IAC representatives are available Monday through Friday (except federal holidays) from 8:30 a.m. to 5:30 p.m. Eastern Time

USPTO FAQ - Questions and Answers (15JUN2006)