Did You Know...
...that the x-ray was discovered purely by accident? When German physicist Wilhelm Konrad von Roentgen was experimenting with cathode rays in 1895, he put an activated Crookes tube in a book and went out to lunch. When he returned, he discovered that a key that had also been placed in the book showed up as an image on the developed film!
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| Number | Title | Issue Date |
| 7931210 | Tire tread railroad tie Re-cycled tire treads are laminated into stacks and attached to a reinforcement element which has a first portion which provides increased compressive strength and a second portion which provides increased torsional and bending strength. Several embodiments with rei... | 04/26/2011 |
| 7331533 | Thermoplastic railroad cross-ties A process is provided for making thermoplastic-composites from recycled thermoplastics (polyolefins) together with phosphogypsum waste by-product from the phosphate fertilizer wet process or, in an equally preferred embodiment with fluorogypsum waste by-product from... | 02/19/2008 |
| 7172136 | Structural members fabricated from waste materials and method of making the same The structural member and fabrication thereof may be formed by mixing wood products chemically treated for durability and thermoplastics products. The fabrication process may included processing the products to a desired particle size; mixing the particles; processi... | 02/06/2007 |
| 6766963 | Recycled rubber railroad crossties A method for the manufacture of a railroad crosstie (90) from recycled rubber is disclosed. The rubber crosstie (90) has an expected life of between 30 to 60 years and can be made primarily of rubber crumbs obtained from stockpiles of discarded rubber ... | 07/27/2004 |
| 6247651 | Composite railway crosstie, shaped like an I beam A railway crosstie is adapted for use in a track system having a pair of rails supported on longitudinally spaced crossties. The railway crosstie includes an I-beam member made of a combination of recycled materials.... | 06/19/2001 |
| 6191228 | Use of recycled plastics for preparing high performance composite railroad ties A method of maintaining proper distance between railroad rails is disclosed. The method utilizes railroad ties manufactured from a composite of polystyrene and polyolefin components, preferably obtained from recycled plastics. The composite exhibits a dua... | 02/20/2001 |
| 6070806 | Sleeper The sleeper (tie) comprises a body which has a variable cross section along its length and is made from reinforced polymer concrete with a dispersed reinforcement in the form of steel or synthetic fibres or both the one and the other together, which fibre... | 06/06/2000 |
| 5722589 | Composite load bearing structure A composite load bearing structure comprises a main body portion having a top surface and a bottom surface defining a dimension of thickness therebetween, first and second side surfaces defining a dimension of width therebetween, first and second end surf... | 03/03/1998 |
| 5713518 | Railroad cross tie and track continuity detector systems A rail tie and track-tie connection includes a molded plastic body member having molded plastic cover pieces attached to the body member, with lip portions engaging and capturing bottom flanges on the track rails. The body member may be hollow with a fill... | 02/03/1998 |
| 5609295 | Composite railway tie and method of manufacture thereof A composite railway tie, and process for manufacture thereof, is disclosed. The composite railway tie comprises a main body portion being made of a first composite material comprising a binding constituent in a proportion of about 10% to about 20% by volu... | 03/11/1997 |
| 5055350 | Composite railroad cross-tie A railroad cross-tie made from sand and recycled thermoplastic containers. To practice the invention the containers made of many thermoplastic materials are granulated and mixed together. The labels and small amounts of residue from the original contents ... | 10/08/1991 |
| 4802623 | Concrete cross sleeper system Modern D.C.-tractioned trains and track circuit signal systems as well as high load trains need a special track construction. A new concrete cross sleeper system is provided for high load and high velocity tracks as well as for urban rapid transit systems... | 02/07/1989 |
| 4416419 | Railway bed A railway bed wherein a body on which rails are to be fitted is formed of an elastic member and rigid member and a reinforcing member is provided within the elastic member or at least on the lower surface of the rigid member. With such formation, the rail... | 11/22/1983 |
| 4381076 | Dropped railroad tie for railway without ballast The construction of steel-concrete railroad ties onto which rails are fixed is disclosed. The ties are composed of a metal saddle for fastening to the rail, comprising a tie-plate extending over a part of the upper surface of the tie and forming the zone ... | 04/26/1983 |
| 4265400 | Concrete sleeper for track circuitry A concrete sleeper for track systems incorporating electrical circuitry, in which sleeper electrically conducting cables are embedded, and therefore concealed therein, with an assembly to allow electrical connection between the cables and associated track... | 05/05/1981 |
| 4150790 | Reinforced molded lignocellulosic crosstie and railway assembly A reinforced railroad crosstie formed by molding and bonding comminuted lignocellulosic material into a monolithic beam around a plurality of reinforcing rods, each of which has a plurality of spaced protrusions fixedly attached along its length at specif... | 04/24/1979 |
| 4151145 | Latex-modified, pretensioned and prestressed structures having enhanced structural load bearing capacity This invention relates to a latex-modified, pretensioned, and prestressed concrete structure having at least about a 50% reduction in bond transfer length as compared to a structure not modified by a latex. Such structure is composed of a cured concrete c... | 04/24/1979 |
| 4106694 | Prefabricated rail base unit consisting of a plurality of projections and a single continuous slab A railroad bed assembly for supporting thereon metallic railroad tracks is formed with a base structure which consists essentially of reinforced concrete made as prefabricated blocks with the base structure including a slab section adapted to be installed... | 08/15/1978 |
| 4098460 | Concrete unit prestressed using tendons stressed before concreting, more particularly a railway sleeper A long concrete unit, prestressed by tendons tensioned before concreting, at least one section of which, near the end of the said unit, is submitted to maximum loads, characterized by the fact that at least one improved-bond prestressing tendon is surroun... | 07/04/1978 |
| 3994436 | Composite railway tie The composite railway tie has performances which are substantially improved over those of ties of the prior art while it results in a saving in weight of metal necessary and in the cost of manufacture. The reinforcement of this tie comprises a lower assembly a... | 11/30/1976 |
| 3957201 | Concrete railroad tie anchor structure An improved anchor structure for use with concrete railroad ties. A modular base plate is cast into the concrete tie with integral upwardly projecting shoulders extending from the base plate which complement it to present a seat to support a steel railroa... | 05/18/1976 |
| 3948010 | Reinforcing device for an element of prestressed concrete The invention relates to the technique of prestressed concrete and concerns a reinforcing device comprising a cylindrical metal tube at the ends of which are friction welded two plates or flanges defining radial support surfaces for bearing on the concret... | 04/06/1976 |
