Did You Know...
...that Charles Goodyear performed some of his experiments on rubber while in debtor's prison? He was there so often he referred to it as his "hotel". Chronically in debt because of poor business sense and ill health, Goodyear depended on the generosity of friends and family. Even after he unlocked the secret to vulcanizing rubber, he was unable to improve his financial situation. When he died, his estate was $200,000 in debt.
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| Number | Title | Issue Date |
| 4177789 | Method for the production of slabs of marble or similar stony material Thin sections of marble or like stone are made by sawing of a block to produce preliminary slabs which are held together, either by integral bridging portions, bonded base portions, or external shoring, while a spacer material, for example resin, is intro... | 12/11/1979 |
| 4164162 | Method of and device for cutting blocks of foamed material A method of and device for cutting blocks of foamed material, e.g. polyethylene. An endless cable of elastic wear resistant material e.g. steel, having a rough surface and a diameter of from 0.5 to 2 mm is preloaded at a force of from 5 to 30kp. The cable... | 08/14/1979 |
| 4005635 | Methods and equipment for machining electrodes A rough-cut blank is machined to provide a spark erosion electrode for use in the manufacture of an extrusion tool by bonding the blank to a base plate, fixing the base plate to a milling machine table and milling the blank. The milled blank is subsequent... | 02/01/1977 |
| 3976045 | Stone cutting machine A stone cutting machine is disclosed comprising a frame, a sliding beam movably supported on the frame, and one or more flexible wires having a plurality of cutting or honing segments projecting from the periphery thereof carried tautly by the beam. Motor... | 08/24/1976 |
| 3957028 | Wire-type cutting machine A wire-type cutting machine comprising a continuously moving wire which is guided over rollers supported by a set of rigid arms in the form of a parallelogram. The wire is pressed against the workpiece by deformation of the parallelogram. Accurate control... | 05/18/1976 |
