Gas shroud and method
Patent 4803335 Issued on February 7, 1989. Estimated Expiration Date: 
June 2, 2007. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
June 2, 2007. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3499137 3600065 3866398 Purge unit for welding apparatus Shielding apparatus Welding torch for underwater welding Method of underwater welding Scavenger hood for laser Underwater welding apparatus Expandable purge unit InventorsAssigneeApplicationNo. 07/056771 filed on 06/02/1987US Classes:219/121.84, With fluid supply219/121.6, Using laser219/121.65MeltingExaminersPrimary: Albritton, C. L.Attorney, Agent or FirmInternational ClassB23K 26/14 (20060101)Foreign Application Priority Data1987-01-07 EPAbstractA gas shroud comprises a chamber having a beam inlet, a gas inlet and an outlet portion. A shroud having an inner surface and an outer surface is operably associated with the outlet portion and is rotatable relative to the chamber. A drive system is operably connected to the shroud for rotating the shroud. A plurality of fins are positioned about the outer surface of the shroud and are rotatable therewith so that rotation of the shroud causes the environment surrounding the shroud to be expelled radially away therefrom. | |
