The following firms have filed for bankruptcy protection recently with local clerk of court offices of the U.S. Bankruptcy Court.

Under Chapter 11 of the federal bankruptcy code, a company is protected form claims by creditors while it attempts to reorganize its finances under a plan approved by the court.

In a Chapter 7 liquidation, a court trustee sells assets to pay creditors' claims. The company then ceases operations.

Rockville Court District of Maryland

Ron Regan Inc. of Bethesda, also known as Reconco Inc. and Regan Construction Co., filed for Chapter 7 liquidation Oct. 30. The company listed assets of $56,000 and liabilities of $422,327.

Montgomery Airpark Business Center L.P. of Bethesda filed for Chapter 11 reorganization Oct. 29. The company listed $8.4 million in liabilities. It did not list assets.

Davidson and Burns Construction Inc. of Lanham filed for Chapter 11 reorganization Oct. 29. The company listed $131,813 in liabilities. It did not list assets.

District Scientific and Medical Supply Inc. of Gaithersburg filed for Chapter 11 reorganization Oct. 25. The company listed $21,843 in assets and $185,825 in liabilities.

Woodscape L.P., a Rockville real estate company, filed for Chapter 11 reorganization Oct. 25. No more information was available.

WBTB Inc., doing business as Doc's Pizza, filed for Chapter 11 reorganization Oct. 25. No further information was available.

Alexandria Eastern District of Virginia

Aardvark Recycling Inc., a stamp recycling company, filed for Chapter 11 reorganization Oct. 25. The company listed assets of $450,000 and liabilities of $700,000.

Tysons Crane Co., a crane rental company in McLean, filed for Chapter 11 reorganization Oct. 30. The company listed assets of $400,000 and liabilities of $380,000. District of Columbia

Gee Kung Tong Inc., a fraternal non-profit organization on 817 6th Street NW, filed for Chapter 11 reorganization Oct. 25. The company listed assets of $250,000 and liabilities of $208,633.

Alancar Inc., which distributes building-labor and materials, was the subject of an involuntary Chapter 7 liquidation petition filed by one of its creditors, Donohoe Companies Inc., a Washington real estate developer. Donohoe listed Alancar's debts at $415,990.

Park Road-12th St. Apartments Ltd. filed for Chapter 11 reorganization on Oct. 26. The company listed assets of $800,000 and liabilities of $1.25 million.