Ind. R. Prof'l. Cond. 7.4
[1] Paragraph (a) of this Rule permits a lawyer to indicate areas of practice in com-munications about the lawyer's services. If a lawyer practices only in certain fields, or will not accept matters except in a specified field or fields, the lawyer is permitted to so indicate.
[2] Paragraph (b) recognizes the long-established policy of the Patent and Trademark Office for the designation of lawyers practicing before the Office. Paragraph (c) recognizes that designation of Admiralty practice has a long historical tradition associated with maritime com-merce and the federal courts.