US 7,255,334 B2Granted

Air suspension piston

AssigneeVAW Alutubes GmbH

InventorsThorsten Schulze, Franz Steimmel, Michael Opitz, Frank Wahner

Life of this patent

Estimating the term…

Abstract

The invention relates to an air suspension piston, with the air suspension piston being tube shaped and being made of aluminium. The air suspension piston is formed by a longitudinal-seam welded tube made from an aluminum alloy, and the tube has been longitudinal-seam welded without any weld metal.

Claims6

Dependent claims

An air suspension piston comprising a longitudinal-seam welded tube welded without any weld metal and made from an aluminum alloy, wherein the aluminum alloy is a self-hardened alloy.

Dependencies are inferred from the claim text.

Facts

Application: 10/329,825Filed 24 Dec 2002 · continuation
Priority: DE 100 18 23812 Apr 2000
Published: US 2003/0127782 A110 Jul 2003
Granted: 14 Aug 2007
Term ends: Not estimatedThe source records don’t support an estimate.

Classification9 codes

F16F 9/057
The flexible wall being of the rolling diaphragm type: characterised by the piston
B21C 37/08
Of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes: making tubes with welded or soldered seams
B60G 2206/424
Springs: plunger or top retainer construction for bellows or rolling lobe type air springs
B60G 2206/7102
Light weight materials: aluminium alloys

Family

Application09/833,035Parent of this continuation · filed 11 Apr 2001
US 2003/0127782 A1Pre-grant publication · published 10 Jul 2003
US 2002/0036369 A1Published application
US 7,255,334 B2This patent

From the US filing history. Foreign family members aren’t listed.

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