Glass annealing lehr having gas and electric heating means
Patent 3997317 Issued on December 14, 1976. Estimated Expiration Date: 
December 14, 1993. 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.
December 14, 1993. 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 2544947 2637754 3261596 InventorAssigneeApplicationNo. 561433 filed on 03/24/1975US Classes:65/350, Plural spaced reheaters432/145, Distinct blowers or blower discharge ports along path432/149, Combustion material supply ports spaced along path432/150, Spaced combustion products exhaust ports65/351Plural spaced cooling meansExaminersPrimary: Kellogg, Arthur D.Attorney, Agent or FirmAbstractThis disclosure relates to glass annealing lehrs in which glass ware is supported on an endless conveyor to convey it through a closed tunnel consisting of separately controllable temperature zones which expose the ware to a glass annealing temperature gradient produced and maintained by gaseous fuel burners and electrical heaters employed separately or jointly, depending upon the availability of the fuel or electrical energy. In accordance with the invention, circulating fans are positioned at both sides of each lehr section, and air inlet ducts are provided for admitting controlled amounts of ambient air to the inlet of each fan.Other References
| |
