Heat sealing apparatus
Patent 4504352 Issued on March 12, 1985. Estimated Expiration Date: 
July 1, 2003. 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.
July 1, 2003. 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 ReferencesApparatus for sealing lap joints of fusible roofing sheets Roofing material handling and sealing machine Apparatus for sealing lap joints of fusible roofing sheets Patent #: 4239581 InventorAssigneeApplicationNo. 06/510279 filed on 07/01/1983US Classes:156/499, With separate (nonpress) heating means for work156/544, Means joining indefinite length work edge to edge156/574, Work traversing type and/or means applying work to wall or static structure156/579With handle or handgripExaminersPrimary: Wityshyn, Michael G.Attorney, Agent or FirmInternational ClassesB29C 65/18 (20060101)B29C 65/20 (20060101) E04D 15/04 (20060101) E04D 15/00 (20060101) AbstractA heat sealing or heat welding apparatus for sealing lapped joints in laid up roof structures having an interchangeable drive for driving either or both of a pair of laterally spaced drive wheels and in which a heating element is selectively movable to plural operative positions including positions in alignment with the drive wheels whereby drive wheels perform the dual function of a traction drive and a pressure roll, and the drive wheels are able to traverse a path of travel coincident with that of the heating element during heat sealing of such lapped joints by the apparatus. The interchangeable drive and multiple operative positions of the heating element permit the apparatus to move forwardly for traverse of the lapped joint in either of the opposite directions of travel therealong.Field of SearchWork traversing type and/or means applying work to wall or static structureWith handle or handgrip Heated With temporary disassembling and subsequent bonding of same laminae Joining indefinite length laminae end-to-end Heating of dry adhesive on lamina prior to assembly contact With separate (nonpress) heating means for work Means joining indefinite length work edge to edge | |
