Patent ID: 8196670

Claim:
A centralizer having first and second opposing end collars, the end collars being axially separated by plural spring bows, the spring bows forming a generally convex curve, with a first set of bows extending from the first end collar substantially axis-parallel for a first distance before extending via the curve into the second end collar, and a second set of bows extending curvedly from the first end collar and into a substantially axis-parallel portion at the second end collar, whereby the centralizer is formed of a single piece, the first set of bows longitudinally offset from the second set of bows whereby upon insertion into a bore one of the first set of bows and the second set of bows engages the bore before the other set, wherein each bow of the first set is between two bows of the second set and each bow of the second set is between two bows of the first set around the end collars.