Did You Know...
...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 |
| 4106477 | Therapeutic self-generating moist heat pad A water activated therapeutic moist heat pad structure is described formed with outer porous water retaining layers which enclose an inner layer of distributed heat generating heat cells and an associated water retaining absorbent inner porous layer. In a... | 08/15/1978 |
| 4095583 | Self-contained warming pad A self-contained warming pad characterized by a heating element, an adjacent dose of activating liquid within a frangible container, and a substantially liquid-impervious cover enclosing the element and frangible container and having at least one tortuous... | 06/20/1978 |
| 4094298 | Separator in electrochemical heating element An improvement in the separator layer of an electrochemical heating element having two electrode layers, a separator layer of porous, absorbent material therebetween, and electrically conductive connector means extending through the electrode and separato... | 06/13/1978 |
