The Collaborative International Dictionary of English v.0.48:

Patent \Pat"ent\, v. t. [imp. & p. p. Patented; p. pr. & vb.
   n. Patenting.]
   To grant by patent; to make the subject of a patent; to
   secure or protect by patent; as, to patent an invention; to
   patent public lands.
   [1913 Webster]

WordNet (r) 3.0 (2006):

patented
    adj 1: (of devices and processes) protected by patent; "they are
           patented inventions"

Moby Thesaurus II by Grady Ward, 1.0:

40 Moby Thesaurus words for "patented":
   armed, authorized, bound, bounded, chartered, cloaked, conditioned,
   confined, copyrighted, covered, cramped, defended, disciplined,
   empowered, enfranchised, entitled, finite, franchised, guarded,
   invulnerable, licensed, limited, moderated, narrow, policed,
   prescribed, privileged, proscribed, protected, qualified,
   restricted, safe, safeguarded, sanctioned, screened, sheltered,
   shielded, strait, straitened, warranted