Acceptance of Termination on L1b Visa

[soumensmail]

I have worked in L1 B visa for 2 years in US. Due to disagreements with employer, I have resigned from my job. My offer letter said 4 weeks under notice period which I will be giving. I have mentioned that my resignation should be effective immediately meaning my notice period should start. But I have not received any acceptance of resignation till now. Can they deny my resignation? I still hope this ends in a better way. But just wanted to know my legal options.

[Mr. Knowitall]

Can they force you to keep working for them? No.

[soumensmail]

Thanks for the reply. But then can they extend my notice period beyond 4 monthes mentioned in offer letter?