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 |
| 5707190 | Blind bolt assembly A blind bolt for fastening superposed construction materials with each other through insertion thereof into through holes formed in the construction materials, which blind bolt comprising a bolt section having a male screw, a flange portion formed at one ... | 01/13/1998 |
| 4639174 | Self-plugging blind rivet The rivet comprises a tubular body 12 having a shank 14 having a rivet head at one end and an end portion 32 of which is tapered externally and internally towards the other (tail) end 20. A stem 10, disposed in the bore 18 of the body, has a stem-tail 22 ... | 01/27/1987 |
| 4427327 | Anchor bolt including elongated spreader wedge An axially elongated fastening element is made up of an anchor bolt and a spreader wedge each having a wedge surface. Initially the two parts are inserted in the unspread condition into a borehole. By providing relative movement in the axial direction bet... | 01/24/1984 |
| 4405273 | Blind fasteners A blind fastener is disclosed which comprises a sleeve and pin of a selected metal in which the pin is designed to form a blind head over a wide range of grips which offers substantially uniform tensile values over the entire grip range. The blind head fo... | 09/20/1983 |
| 4050120 | Fastener A fastener is made of a flexible material for use, for example, in a vehicle to hold a leg member on a plate inserted in an opening in a panel. The fastener comprises a tubular base, a tubular inner portion formed within the base, and a connecting portion... | 09/27/1977 |
| 4033243 | Container fastener system There is disclosed a novel fastener assembly for use in attaching a composite panel section or the like to a frame section. The fastener assembly comprises a first member for engagement in a bore formed in said frame section, said member including an enla... | 07/05/1977 |
| 3959853 | Fastening peg and method of making same This fastening device comprises a central internal plug formed with retaining notches and engageable in an external peg consisting of separate legs formed with internal and external notches and connected to the inner end of said plug by means of flexible ... | 06/01/1976 |
