In many cases I had to resort to saving as TIFF and re-importing into Adobe, but of course this was time consuming, resulted in the loss of all search capabilities, and required a file that takes up considerably more space. I previously unsuccessfully tried saving as Postscript and then distilling and any number of other options. Even though one's system may substitute fonts, you cannot easily force such a substitution to be embedded. The problem is you may have received documents that have security settings on them or use fonts that you might not have - all of which thwarts the ability to submit compliant documents.
Goodbye Preview, hello affordable PDF editing on Mac. One of the best apps to handle or edit PDFs on your Mac. PDF Expert is a more powerful solution than the built-in Preview app and more cost-effective than Adobe Acrobat DC. I am usually not the originator of these documents. PDF Expert is the lightweight, powerful PDF viewer your Mac needs. I send 'electronic' documents to the USPTO which now scans them for embedding of all fonts. Well, Print to PDF does not work when you are starting out with a PDF file. I did read one of the replies which suggested that one only had to use 'Print to PDF'.