British merchant Peter Durand invented the tin can in 1810.
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| Number | Title | Issue Date |
| 5175526 | Inductance device, particularly for short waves The invention concerns an inductance device formed on the basis of an asymmetrical line. This inductance device includes a plane conductor, preferably cylindrical, a linear conductor extending along and close to the plane conductor and having one end shor... | 12/29/1992 |
| 5032816 | Longitudinally contoured conductor for inductive electrical devices An improved conductor for an inductor device of the type having varying current carrying requirements along the length of the conductor, the improvement comprising having the conductor contoured such that the cross sectional area of the conductor varies s... | 07/16/1991 |
| 4441092 | Variable inductance with variable pickoff and variable flux medium permeability A variable inductor includes a coil, a moveable contactor, and moveable magnetic material caused to move proximate the coil and simultaneously with the contactor. The contactor establishes first and second portions of the coil and, relative to the conditi... | 04/03/1984 |
| 4415873 | Variable inductor having reduced arcing tendency A variable inductance includes a coil and a moveable contactor which maintains continuous contact with the coil. An electrical connection, which is moveable along with the moveable contactor and away from a first end of the coil, connects the moveable con... | 11/15/1983 |
| 4412200 | Variable inductor with carriage for multiple trolley wheels As part of a moveable carriage assembly, a plurality of trolley wheels are capable of being driven, in worm-gear fashion, along a coil which is rotatable about its axis. One end of the coil is conductive and the other end of the coil is preferably non-con... | 10/25/1983 |
| 4408177 | Variable inductor having extended useable frequency range A plurality of moveable contactors may travel along a rotating coil, one end of which is conductive and the other end of which is non-conductive. Two or more electrically interconnected moveable contactors effect a shorting across unused electrical turns ... | 10/04/1983 |