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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 |
| 5774272 | Low-magnification apochromatic microscope objective lens Low-power objective lenses for a microscope are disclosed. The objective lenses exhibit apochromatic optical performance at a numerical aperture of at least 0.1 and have a magnification of about 2× or less. Each such objective lens comprises, in order fr... | 06/30/1998 |
| 4653871 | Rear conversion lens A rear conversion lens is composed of a front lens group comprising three lenses of positive, negative and positive from the object side and a rear lens group comprising two lenses of negative and positive from the object side and satisfying certain condi... | 03/31/1987 |
| 4232944 | Standard photographic lens A standard photographic lens system comprising a first positive meniscus lens component, a second meniscus cemented doublet lens component, a third meniscus cemented doublet lens component and a fourth positive lens component. In said lens system, large r... | 11/11/1980 |
| 4123144 | Four-member gauss objective A four component six lens element Gauss type objective having an aperture ratio of at least 1:2.4 and a field angle of greater than 40° , comprising in the direction of light travel: a first single component positive meniscus concave toward the diaphragm... | 10/31/1978 |
