In the U.S., an employee that resigns is not entitled to severance. In this case, you would only have received severance if you had been terminated before your resignation date. If they sent you home but continued to pay you for that month, you would not have been entitled to severance.
This is correct, unless there's a reason why they should... and if they are smart, the severance will include setting the term date to the severance date.
I don't understand your comment. The only circumstances in which a resigning employee is entitled to severance is if they have an employment contract entitling then to severance in the event of a voluntary departure.
Even executives don't get that. A run of the mill employee definitely won't.
