Modular structure system
Patent 6722086 Issued on April 20, 2004. Estimated Expiration Date: 
December 4, 2021. 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 4, 2021. 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 1471520 2001215 3002590 3912410 Connecting apparatus for frame members Structural connection means Prefabricated spatial structure Tubular beam joint Mechanical end joint system for structural column elements Space frame connectors InventorApplicationNo. 10005239 filed on 12/04/2001US Classes:52/81.3, Frame connection detail52/653.2, Having tubular member403/171, Polyhedral403/176PolyhedralExaminersPrimary: Friedman, Carl D.Assistant: Slack, Naoko Attorney, Agent or FirmInternational ClassE04B 708AbstractThe present invention provides an improved modular system for constructing a tubular structure. The improved system allows the tubing to be assembled and disassembled in a direction perpendicular to a centerline of the tubing without having to move the tubing along its centerline. The improved system allows the tubing to be positioned at various angles. The system also enables curved tubing to be used. In an embodiment, the structural system includes a hub and a connector that removably couples to the hub. The connector has a first end that couples to the hub and a second that defines a notch. One of the walls of the notch connects to a flange that may extend in one or two directions from the centerline of the connector. The connector and flange removably couple to one end of an adapter, which contains a mating notch, wherein the adapter receives a tube.Other References
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