Low headroom culvert
Patent 4141666 Issued on February 27, 1979. Estimated Expiration Date: 
February 16, 1998. 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.
February 16, 1998. 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 587392 832017 905290 InventorAssigneeApplicationNo. 05/878496 filed on 02/16/1978US Classes:405/126, Serially connected segments405/150.1LiningExaminersPrimary: Shapiro, JacobAttorney, Agent or FirmInternational ClassE03F 5/00 (20060101)AbstractImproved low headroom culvert comprised of a plurality of shallow arch-shaped corrugated culvert sections and elongated unitary load transferring stringer stiffener elements, the stringer stiffener elements being arranged in generally spaced parallel relation to each other and secured to the inside surfaces of said sections. The stringer elements extend for substantially the full length of the culvert thereby acting to integrate the culvert sections into a unitary overall culvert structure. Certain of the stringer elements are located a selected distance inwardly from the free bottom edges of the culvert sections and provide combination culvert reinforcing stringer elements and elongated footings and soil supports. | |
