Here's some more from the FDIC to back up Dave's point:
"In summary, if the applicant (the business in your example) applies for individual credit and meets the creditor's standards for creditworthiness, Regulation B prohibits a creditor from requiring either the additional signature of a cosignor on the credit instrument or a guarantor.
If the applicant does not meet the creditor's credit standards, the creditor can require a co-signor (can't name them) or guarantor (can name officers, directors, etc.) but it cannot require that the cosignor or guarantor be the applicant's spouse."
Here's a a few links including what I've quoted:
D. For more information on requiring signatures, please refer to the following memorandums:
1. Guidance on Avoiding Violations of the Spousal Signature Provisions of Regulation B, FIL-9-2002:
http://www.fdic.gov/news/news/financial/2002/fil0209.html2. Consumer Compliance Outlook – 4th Quarter 2008:
http://www.philadelphiafed.org/bank-reso...arter/q4_02.cfm3. Spousal Signature Provisions of Regulation B, FIL 6-2004:
http://www.fdic.gov/news/news/financial/2004/FIL0604.html