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...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 |
| 6071919 | Zwitterionic compositions and methods as biological response modifiers A method of treating a disease in a mammal by administering a therapeutic effective amount of an amphoteric zwitterion compound as an active ingredient. A pharmaceutical composition which comprises an amphoteric zwitterionic compound as an active ingredie... | 06/06/2000 |
| 5716959 | Method of treating disease with piperazine zwitterion compounds A substituted piperazine zwitterion composition containing, for example, as an active ingredient, HEPES (N-2 Hydroxyethylpiperazine-N'-2 Ethane Sulfonic Acid), and method useful for treatment of cancer, autoimmune, arthritis and other mammalian diseases.... | 02/10/1998 |
