In general, companies do not have a process of replying back to the candidates unless they are selected. However, some multinational companies have a standard system driven practice of sending replies to the interview candidates. I would suggest to drop in a mail to the company HR requesting for a feedback if you have the company HR email id.
As Nanda Kishore directed, you can always drop a mail in the concerned forum of their official website citing your date, name and venue of the in-person interview. Be sure of getting a reply, whatever that may be.
Wishing you all the luck for your future.