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| All Patents in class 307/48 | |||||
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| Number | Date | Patentee | Title | Type | |
| 324,621 | Aug. 18, 1885 | S.S. Wheeler | Electric Elevator | elevators and lifts | |
| 434,489 | Aug. 19, 1890 | E. Thomson | Electric Power System | electric distribution systems | |
| 541,200 | Jun. 18, 1895 | R. Eickemeyer | Electric elevator | ||
| 6,262,559 | Jul. 17, 2001 | T.P. Becker, D.M. Eggert | Portable Auxiliary Charging Battery Pack for Thin Metal Film Battery Power Pack | ||
| 6,262,560 | Jul. 17, 2001 | D.M. Eggert, T.P. Becker, D.D. Lionberg | Battery Pack Discharge Recovery Circuit | ||