...that after Walter Hunt patented the safety pin in 1849, he sold the rights to it for $400?
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| Number | Title | Issue Date |
| 7029792 | Recombinant separator A heterogeneous, cellulose battery separator made of a mixture of cellulose and a polymer with hydrogen permeability for use in zinc-based batteries exhibiting increased hydrogen transport through the membrane while maintaining low electrical impedance and exhibitin... | 04/18/2006 |
| 6943530 | Battery charging system A battery charging system comprising: a current source; a battery; and a voltage and current regulator, which regulates voltage applied to the battery and current supplied to the battery. The battery charging system shapes the current supplied to the battery, and ma... | 09/13/2005 |
| 6943529 | Battery charging system A battery charging system comprising: a current source; a battery; and a voltage and current regulator, which regulates voltage applied to the battery and current supplied to the battery. The battery charging system shapes the current supplied to the battery, and ma... | 09/13/2005 |
| 6929884 | Method for manufacture of films containing insoluble solids embedded in cellulose-based films A film which slowly releases solids is prepared by dissolving cellulose in a solvent such as an alkali metal salt, for example L1Cl in a polar solvent such as DMAC, dispersing the solid in the solution and gelling the solution with water to form a film. | 08/16/2005 |
| 6884542 | Method for treating titanium to electroplating A container method for pre-treating the inside surface of a titanium container before electroplating a metal conductive such as silver to increase adhesion for use in a lightweight alkaline battery comprising the step of applying an alkaline solution of peroxide to ... | 04/26/2005 |
| 6806681 | Battery holder An increased capacity battery holder, which allows a device to be used for a longer time duration than can be achieved from solely internally contained batteries, capable of providing additional energy to the device, beyond internal space and volume limitations of t... | 10/19/2004 |
| 6743548 | Silver-zinc alkaline rechargeable battery (stacking order) A rechargeable, alkaline, zinc-based battery containing a stack of hydrogen permeable cellulose-based films, each one optionally containing a dispersion of metal salts. A film may contain copper salt that reacts with cellulose to prevent zinc dispersion. A second fi... | 06/01/2004 |
| 6733920 | Recombinant separator A heterogeneous, cellulose battery separator made of a mixture of cellulose and a polymer with hydrogen permeability for use in zinc-based batteries exhibiting increased hydrogen transport through the membrane while maintaining low electrical impedance and exhibitin... | 05/11/2004 |