Bizarre Patents
A method of swing on a swing is disclosed, in which a user positioned on a standard swing suspended by two chains from a substantially horizontal tree branch induces side to side motion by pulling alternately on one chain and then the other.
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| Number | Title | Issue Date |
| 6733128 | Microscope for noncontact wide-angle viewing Microscopes with a noncontact wide-angle viewing scope are used during surgeries on the eye, wherein an electromotively adjustable optic is provided between the lens and the eye. In order to prevent the surgeon from interrupting the surgery in order to refocus and t... | 05/11/2004 |
| 5568188 | Video attachment to a microscope The video attachment is an apparatus to be mounted laterally on a microscope and which is independent of the optic of the microscope. The apparatus comprises an imaging lens system and a video camera. The light beam path in the apparatus is deflected in s... | 10/22/1996 |
| 5455645 | Refractometer for measuring spherical refractive errors A refractometer for measuring spherical refractive errors of an eye is shown. The refractometer includes an objective first lens system adapted to be moved along a predetermined path between a first position and a second position. A linear diopter scale m... | 10/03/1995 |
| 5420651 | Refraction device for the subjective determination of the spherical and astigmatic sight properties of the eye There is described a refraction device for the subjective determination of the spherical and astigmatic sight properties of the eye of a patient, which has a beam dividing device for two partial beam paths. Arranged in each partial beam path is a cylindri... | 05/30/1995 |
| 4299455 | Vision testing instrument A vision testing instrument has a projecting optical system for projecting a test chart to produce an aerial image. In the optical system, there is provided a focusing reflector for producing a chart image at a far point. A second focusing reflector is pr... | 11/10/1981 |
| 4243304 | Convergence mechanism for binocular refracting instrument A mechanism which has a continuously variable amount of convergence and inward movement over the entire range of pupillary distance (PD) settings is disclosed. The repositioning of a pair of straight tracks transfers a continuously variable amount of moti... | 01/06/1981 |
