I searched http://dwd.wisconsin.gov/er/labor_standards_bureau/default.htm but was unable to find any reference to accrued vacation pay. In most states the rule is that if the employer promises vacation pay, he must accrue it and it is owed to the employee, just like wages. When a business is sold the buyer may take over contractual obligations, or he may not. I think you should ask your employer now what he intends to do about it. If he does not promise again that it will be paid, you should plan to file a wage and hours complaint with the labor standards bureau in WI.
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(Bryant) Keith Martin