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 |
| 6945566 | High-pressure connection device A high-pressure connection device with a housing having a receiving opening into which an inlet conduit discharges. A pressure tube connector stub discharges on one end into an end face of the connector stub and has a male thread, which engages a female thread in th... | 09/20/2005 |
| 5527140 | Bush for lockbolt rivet, and associated tool The invention concerns a bush (13) to be formed around a lockbolt rivet (4) by means of a tool (14) which applies a longitudinal force, thus producing a high-strength riveted joint. The bush has substantially the shape of a hollow cylinder, but its shape ... | 06/18/1996 |
| 4826375 | Variable diameter screw fastener Preferred embodiments (60, 70) of a fastener adapted to secure any selected one of a plurality of threaded members (S") are provided. Fastener (60) features substantially parallel spaced-apart flat plate members (2, 4) preferably folded from one piece to ... | 05/02/1989 |
| 4714392 | Self-locking sheet-metal nut A self-locking sheet-metal nut having a generally flat leg with an embossed thread portion for receipt of a screw and a pair of locking tabs resiliently and integrally connected to one end of said leg that extend over and are spaced from the leg. The tabs... | 12/22/1987 |
| 4179067 | Railway track hold-down hardware A base member, such as a cross tie, is molded of reinforced concrete or wood chips and resin. Depressions in the top of the base member are lined with pads of cushion material to seat the flanges of the rails. A pair of hold-down clips is seated on each p... | 12/18/1979 |
| 4158377 | Captive screw device This captive screw device consists of a resilient retaining support for holding screws in predetermined positions in alignment with or within through holes formed in a member to be fastened by said screws to another member or a structure. Each support com... | 06/19/1979 |
| 4143696 | Self-locking, self-retaining fastener An improved self-retaining fastener which allows non-rotational, longitudinal insertion of an externally threaded fastener and prevents non-rotational, longitudinal removal thereof. The improved fastener includes antirotation means adapted for frontal ins... | 03/13/1979 |
| 4044809 | Tightening and sealing device A tightening and sealing device is made from plastic material and includes two members which can be coupled to each other. The member acting as the tightening element includes an internally threaded hollow cylinder divided into three cylindrical segments ... | 08/30/1977 |
