Collapsible shelter
Patent 4068418 Issued on January 17, 1978. Estimated Expiration Date: 
January 17, 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.
January 17, 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 2066960 2297150 3172166 3258883 3364632 3599677 3899853 InventorApplicationNo. 05/695198 filed on 06/11/1976US Classes:52/2.21Upstanding column (e.g., mast, tower)ExaminersPrimary: Perham, Alfred C.International ClassE04H 15/20 (20060101)AbstractAn inflatable structural member and a structure employing such inflatable members. The structural members each comprise an inner, air-impermeable inflatable tube made from an inexpensive, extruded, thermoplastic material; and an outer flexible sheath restraining the inner tube when it is inflated. The sheath is also constructed to shape the tube to a desired curved shape. | |
