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...Daniel Webster invented a "bull plow" to pull out tree stumps. It didn't catch on because it was huge and required four oxen to pull it!
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| Number | Title | Issue Date |
| 5659425 | Immersion microscope objective The invention provides an immersion microscope objective which has a magnification of about 100× and a high numerical aperture of the order of 1.65, and is particularly excellent in axial optical properties. The first lens unit G1 consists of ... | 08/19/1997 |
| 5530590 | Liquid-immersion type objective lens system for microscopes A liquid-immersion type objective lens system for microscopes comprising a first lens unit which comprises a plano-convex lens component or a plano-convex lens component having a cemented surface strongly convex on the image side and a positive lens compo... | 06/25/1996 |
| 5517360 | Immersion microscope objective An immersion microscope objective which has a magnification of about 60, an NA of 1.4, and a reduced number of constituent lens elements and yet which is satisfactorily corrected for spherical and axial chromatic aberrations and is also superior in the fl... | 05/14/1996 |
| 5502596 | Immersion microscope objective An apochromat-class immersion microscope objective having a magnification of about 40, a NA of about 1.0, and a satisfactorily flattened image field. The microscope objective includes a first lens unit G1 of positive refractive power which has a cemented ... | 03/26/1996 |
| 5274503 | High aperture finite conjugate lens system suitable for use as a micro relay lens A high aperture finite conjugate lens suitable for use in applications requiring high numerical aperture on both object and image sides of the lens such as laser thermal printer system.... | 12/28/1993 |
| 5235465 | Objective lens system for use within microscope An objective lens system for use within a microscope includes a first to an eleventh lens which are disposed in that order from an object side to an image side with predetermined air spacings therebetween. The first lens in the form of a meniscus is made ... | 08/10/1993 |
| 5191473 | Objectives An objective of some 10 magnifications usable with microscopes, etc. which has an increased numerical aperture and working distance, including a first lens component that is a cemented lens consisting of negative and positive lens elements, a second lens ... | 03/02/1993 |
| 5144475 | Objective lens system for use within microscope An objective lens system for use within a microscope includes six lenses which are spaced apart from an object side. The first, the third and the fifth lenses are made of quartz, the fourth and the sixth lenses are made of fluorite, while the second lens ... | 09/01/1992 |
| 5103341 | UV-capable dry lens for microscopes An UV-capable dry objective for microscopes in which aperture aberration is corrected, at the same time, both for the visible spectrum and for a selected UV-wavelength. The objective comprises two lens groups separated by an air gap which is varied in siz... | 04/07/1992 |
| 4721372 | Objective lens system for an endoscope An objective lens system for an endoscope comprising a first lens component arranged as a positive meniscus lens, a second lens component arranged as a biconvex lens, a third lens component arranged as a positive cemented doublet, a fourth lens component ... | 01/26/1988 |
| 4666256 | Microscope objective lens A microscope objective lens which, in spite of having a great numerical aperture and a high magnification, can always maintain an excellent imaging performance even if the thickness of a parallel flat plate such as a cover glass disposed between the objec... | 05/19/1987 |
| 4591243 | Microscope objective A microscope objective comprising a first lens component arranged as a positive meniscus lens, a second lens component arranged as a positive lens, a third lens component having positive refractive power, a fourth lens component having positive refractive... | 05/27/1986 |
| 4588264 | Microscope objective lens A microscope objective lens of medium or high magnification having a great working distance and yet having an excellent imaging performance comprises, in succession from the object side, a first lens group of positive refractive power for converting a lig... | 05/13/1986 |
| 4563060 | Microscope objective A microscope objective comprising a first, second, third, fourth, fifth and sixth lens components wherein the first lens component is a positive meniscus lens concave toward the object side, the second lens component comprises a positive lens and has posi... | 01/07/1986 |
| 4540248 | Objective lens system for microscopes An objective lens system for microscopes comprising a first positive lens component, a second positive cemented doublet, a third lens unit comprising at least one cemented lens, a fourth meniscus cemented doublet having a convex surface on the object side... | 09/10/1985 |
| 4537472 | Objective lens system for microscopes An objective lens system for microscopes designed for a magnification level of 60X and NA of 1.4, excellent in contrast and resolution, and comprising a first cemented doublet component comprising a plano-convex lens element and a meniscus lens element ha... | 08/27/1985 |
| 4521086 | Objective for an IC mask testing device An objective for an IC mask testing device comprising a first, second, third, fourth, fifth and sixth lens components wherein the first lens component is a positive meniscus lens, the second lens component is a biconvex lens, the third lens component is a... | 06/04/1985 |
| 4521083 | Microscope objective A microscope objective comprising a first, second, third, fourth, fifth and sixth lens components wherein the first and second lens components are positive lenses respectively, the third lens component is a positive cemented lens, the fourth lens componen... | 06/04/1985 |
| 4505553 | Microscope objective A microscope objective with magnification about 100× comprising six lens components wherein the third lens component is a cemented lens component consisting of three lens elements wherein the second lens element is a negative lens having strong power, th... | 03/19/1985 |
| 4384765 | Six-component microscope objective An infinity-corrected, semi-apochromatic microscope objective having an N.A. of 0.95 has five elements and provides a magnification of 100× when used with a telescope objective having an effective focal length (efl) of 183 mm.... | 05/24/1983 |
| 4322136 | Microscope objective lens system A microscope objective lens system by using a Gauss type lens system, in which the N. A. is large, the working distance is long, the image surface is flat over a wide angle of view and various aberrations are well corrected. The system comprises a first l... | 03/30/1982 |
| 4261654 | Air gap type microscope objective A six member microscope objective having a numerical aperture of substantially 0.90 and a magnification of substantially 100x for use without oil is disclosed.... | 04/14/1981 |
| 4232941 | Objective lens system for microscopes An objective lens system for microscopes which has a large numerical aperture and a long working distance and wherein the secondary spectrum is sufficiently minimized and curvature of field, coma, etc. are favorably corrected over a wide range of visual f... | 11/11/1980 |
| 4232940 | Objective lens system for microscopes An apochromat type high magnification objective lens system for microscopes comprising a first cemented semispherical lens component, a second positive meniscus lens component, a third cemented lens component consisting of three lens elements, a fourth ce... | 11/11/1980 |
| 4059342 | Microscope objective with correcting means A microscope objective with correcting means comprising a front lens group arranged on the object side of a pre-determined airspace and rear lens group arranged on the image side of said airspace and arranged to correct aberrations, which will be caused b... | 11/22/1977 |
| 4027951 | Parfocal low-magnification microscope objective lens systems A parfocal low-magnification microscope objective lens system comprises, in succession from the object side, a positive first lens member, a negative second lens member and a positive third lens member. The first lens member has its concave surface facing... | 06/07/1977 |
| 4009945 | Microscope objective A microscope objective of the strong, dry type wherein the lenses at the object end of the system are particularly small and wherein the curvature of the field is corrected and the image field is flattened by a front lens consisting of a thick meniscus le... | 03/01/1977 |
