Bizarre Patents
A method of swing on a swing is disclosed, in which a user positioned on a standard swing suspended by two chains from a substantially horizontal tree branch induces side to side motion by pulling alternately on one chain and then the other.
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| Number | Title | Issue Date |
| 6156093 | High strength, ductility, and toughness tungsten heavy alloy (WHA) materials A method of imparting high strength, high ductility, and high fracture toughness to a refractory metal alloy workpiece includes: (i) subjecting the workpiece to at least one pass that reduces the initial cross-sectional area of said workpiece, (ii) anneal... | 12/05/2000 |
| 4900375 | Magnesium-treated, decarburizingly-annealed cast iron material A magnesium-treated, decarburizingly-annealed cast iron material includes 4% or less carbon by weight, 2% or less silicon by weight, at least 0.010% magnesium by weight, and at least 0.001% sulphur by weight, the remainder being iron. The cast iron materi... | 02/13/1990 |
| 4173500 | Process for producing porous cast iron A process for producing porous cast iron, wherein cast iron having flake graphite structure is subjected to heat treatment in a high temperature gas atmosphere in which the iron component of the cast iron base is not subjected to oxidation and on the othe... | 11/06/1979 |
