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 |
| 7310989 | Hydraulic circuit for linearly driving a movable roller-holder slider of a pipe bending machine A hydraulic circuit for linearly driving a movable roller-holder slider of a pipe bending machine, comprising a hydraulic cylinder (5) whose piston rod is connected to a slider holding a movable roller, the cylinder being fed with pressurized fluid from a res... | 12/25/2007 |
| 6800110 | System for producing noble metals A system for producing significant quantities of noble metals from low-grade ore. A mixture of particulate feed containing small amounts of noble metals, a base metal, and activated carbon are placed in a non-conducting container. The container is surrounded by a co... | 10/05/2004 |
| 5053596 | Apparatus and method of induction-hardening machine components with precise power output control An induction-hardening machine for the contour hardening of machine components such as gears includes a system processor which controls thyristor power switching circuits which supply high-power signals to an RF generator. Power switching circuits include... | 10/01/1991 |
| 4303228 | Apparatus for heat treating containing air-purged molecular sieves in O.sub. -free N2 atmospheres Carbonaceous combustion products (i.e., principally carbon dioxide) and water are removed from nitrogen generator gas by molecular sieve adsorption thereof. The molecular sieve material is regenerated by an initial extended purging with ambient air under ... | 12/01/1981 |
