Can I legally apply for L type visa and do my own business without any sponsored.

I assume that when you refer to the H-1B visa expiring in October 2012, you are referring to the maximum limit of 6 years which can only be extended under certain circumstances. An L-1 visa does not appear appropriate as that is a visa status for multinational executives/managers/specialized knowledge individuals who have been in one of the 3 roles for an affiliated company overseas for at least one year in the past 3. Another visa option may be O-1 if you are extraordinary in your field of endeavor and have a sponsoring organization or agent. Further H1B visa status is available again for 6 more years if you leave the U. S. for one year, have a sponsoring organization, and qualify for the H-1B cap again if the organization is not exempt from the requirement. Also in the event that an organization sponsors you for labor certification processing, you may be able to be placed back in H-1B status by a petitioning employer once 365 days have run since labor certification filing or at the time that both labor certification and I-140 preference petition classification have been approved. Due to the limitations of the Lawyers.com Forums, Alan Lee, Esq.'s (the "Firm") participation in responding to questions posted herein does not constitute legal advice, nor legal representation of the person or entity posting a question. No Attorney/Client relationship is or shall be construed to be created hereby. The information provided herein by the Firm is general, and requires that the poster obtain specific legal advice from an attorney. The poster shall not rely upon the information provided herein as legal advice nor as the basis for making any decisions of legal consequence