Gas-fired boiler
Patent 4091768 Issued on May 30, 1978. Estimated Expiration Date: 
May 30, 1995. 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.
May 30, 1995. 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 1625082 3242910 3388692 3478706 3623458 3792729 3800748 InventorAssigneeApplicationNo. 752550 filed on 12/20/1976US Classes:122/367.3, Corrugated and finned heat transmitters122/360, Closures and couplings165/175Inlet and outlet header meansExaminersPrimary: Sprague, Kenneth W.Attorney, Agent or FirmInternational ClassesF22B 037/10F28F 009/06 Foreign Application Priority Data1975-12-22 NLAbstractA gas-fired boiler having a bed of copper finned tubes arranged between the combustion space and the flue. The ends of the tubes extend through a tube plate into a water header. The connection is sealed with a compressed gasket. For protection of the gasket, the openings in each tube plate and header for allowing the passage of tube end are arranged asymmetrically in the direction of the burner bed. | |
