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| Number | Title | Issue Date |
| 4390306 | Composite arch structure A composite arch structure and method of making it are taught. The composite arch structure comprises a pair of retaining wall portions and a top arch portion extending therebetween. A stiffening and load distributing member is structurally affixed to the... | 06/28/1983 |
| 4322179 | Open top drain A corrugated metal open top pipe drain for the collection and removal of surface water from paved areas, such as highways, parking lots, airports and the like.... | 03/30/1982 |
| 4314775 | Method of site casting tunnels, culverts, pressure pipes with minimum forming A method is disclosed for the construction of structures for tunnels, culverts, and pressure pipes of any size and shape, straight or curved, constant or variable cross section. The method requires very little formwork, with all work done on site. The met... | 02/09/1982 |
| 4252464 | Device for limiting stresses in particular for buried tubular structures A device for limiting stresses exerted by neighbouring ground on a buried structure which comprises at least two neighbouring elements which form at least one part of the wall of the structure. The stress limiting device comprises at least one longitudina... | 02/24/1981 |
| 4211504 | High strength corrugated metal plate and method of fabricating same Corrugated steel plate is formed from a flat plate stock and has a length of at least about 12 feet, a corrugation pitch of at least about 12 inches, and a corrugation depth of at least four inches. The plate has thicknesses of up to 1/2 inch and more. Al... | 07/08/1980 |
| 4011726 | Delta culvert This invention provides an all-wooden culvert shaped as an equilateral triangle in which the three sides are joined solely by interlocking of the structural members in notches in each member. All sides are composed of a series of identical members which f... | 03/15/1977 |
| 3981153 | Body plate serving to secure drain pipes in embankments A multiple component body plate serving to secure drain pipes in embankments is shown. A flat body plate is provided which serves as a support bearing and which has a generally rectangular cutout therein extending from one edge. A plurality of insert plat... | 09/21/1976 |
