A secured creditor does not need to file a such a claim, the lien against the property is sufficient proof. Generally the lien holder/lender will ask for the automatic stay to be lifted so foreclosure or repossession action can continue or be implemented against the property. In a chapter 7 bankruptcy the borrower must be able to reaffirm the secured debt to avoid recovery or litigation action from the lender.
If it is not a secured debt it will be included in the bankruptcy discharge.
This is not a question. If your question is, "What happens when the trustee moves the Court to declare a secured claim withdrawn," then one should object, particularly if the secured creditor still has a claim. If this is chapter 7, a secured creditor has no claim except on its collateral. In chapter 13, fight for your claim.
Actually, a secured creditor only retains priority if they file a claim.
If you signed a Security Agreement, then your creditor has a secured claim on the collateral specified in the agreement.
When there are two secured parties claiming security interest in the same collateral, the creditor that is perfected (having filed a financing statement) will have priority over the interests of an unsecured creditor or unperfected secured party
"How is a claim filed as an unsecured creditor to the US bankruptcy court case 07-23686-RG?"
File a proof of claim
Yes
No, a creditor is required to file a claim if seeking payment, otherwise that claim is considered waived. So in this case. if there was no claim, then it was waived and the debt discharged. But even if it was filed, it would have been discharged in the business BK.
No, Generally, they must file a "proof of claim", which can be done by mail...but that is about all.
By filing a proof of Claim, or by addressing questions/arguments to the court
The percentage paid to unsecured creditors in a Ch 13 is determined by your disposable income. Secured creditors get paid at 100%, house and car payments remain the same. What's left over gets paid out to those unsecured creditors who file proofs of claim. If a creditor does not file a claim, then that creditor does not get paid.