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3M employee and church chorister Art Fry needed something to temporarily mark pages in his hymnal. He was in luck because his colleague, Spencer Silver, accidentally developed a glue that was too weak for other purposes. After initially discouraging consumer response, Post-it Notes became a hit in 1979.
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| Number | Title | Issue Date |
| 4666257 | Compact zoom lens A compact zoom lens including, from front to rear, a first lens unit of positive power, a second lens unit of negative power, a third lens unit of positive power and, if desired, further a fourth lens unit, with the separations between the first and secon... | 05/19/1987 |
| 4666258 | Afocal zoom lens system An afocal zoom lens system comprising a first lens group having positive refractive power, a second lens group having negative refractive power, a third lens group having positive refractive power, and a fourth lens group having negative refractive power,... | 05/19/1987 |
| 4653873 | Zoom lens Provided is a zoom lens including four lens groups having refracting powers of negative, positive, negative and positive, respectively, arranged in the mentioned order from the objective side of the zoom lens, wherein, upon zooming from a short forcal len... | 03/31/1987 |
| 4639096 | High range zoom lens The disclosed zoom lens is composed of four lens groups. Counting from the front, the first lens group has a positive power, the second a negative power, the third a positive power and the fourth a positive or a negative power. At least the first, third a... | 01/27/1987 |
| 4629294 | Zoom lens A zoom lens includes, from front to rear, a positive first component, a negative second component, a positive third component and a positive or negative fourth component. The first, third and fourth components are movable to vary the focal length of the e... | 12/16/1986 |
| 4592626 | Compact zoom lens system A compact zoom lens system is disclosed having a first lens group with positive refractive power, a second lens group with negative refractive power, a third lens group with positive refractive power, and a fourth lens group with negative refractive power... | 06/03/1986 |
| 4591235 | Zoom lens system A zoom lens system of a relatively high zoom ratio about 2.5 to 3.5 ranging to a wide field angle such as 76 degrees is disclosed. The zoom lens system comprises, from the object to the image side, a first movable negative lens group, a second movable pos... | 05/27/1986 |
| 4571032 | Zoom lens A zoom lens includes a zoom portion for forming a virtual image of an object lying between infinity to a very short distance always at a predetermined position and for varying the imaging magnification of the virtual image, and a relay portion including a... | 02/18/1986 |
| 4516839 | Zoom lens system A zoom lens system comprising a first lens group of a negative refractive power, a second lens group of a positive refractive power located on the image side of the first lens group with a first variable air space, a third lens group of a negative refract... | 05/14/1985 |
| 4515446 | Zoom objective A zoom objective comprising four lens groups of which the first three lens groups counting from the object side are movable for zooming, whereby the refractive powers and the conditions of zooming movement of the aforesaid three lens groups are properly s... | 05/07/1985 |
| 4466708 | Zoom lens A zoom lens which will continuous close focus to a magnification of 1:4, comprising three groups where the third group from the object end is stationary, the second group moves axially to vary the equivalent focal length, and the first group moves axially... | 08/21/1984 |
| 4398808 | Compact zoom lens of high magnification A compact zoom lens of high magnification comprises four lens groups. In succession from the object side, the first lens group has a positive refractive power and a focusing function, the second lens group has a negative refractive power and a magnificati... | 08/16/1983 |
| 4368955 | Variable-focal-length objective The variable-focal-length objective for motion-picture cameras and especially color television cameras comprises two movable groups of lens elements placed between two stationary groups of lens elements and capable of displacement so as to produce a varia... | 01/18/1983 |
| 4368954 | Compact zoom objective The compact zoom objective disclosed includes, from front to rear, a first lens group having positive power, a second lens group of negative power, a third lens group of positive power for collimating incident rays of light, and a fourth lens group of pos... | 01/18/1983 |
| 4345822 | Telephoto zoom lens A compact zoom lens for a 35 mm SLR camera having a focal length at the telephoto end extending into a super telephoto region and having a zoom ratio greater than four. The zoom lens includes, in order from the object side, a first lens group having a pos... | 08/24/1982 |
| 4345821 | Zoom lens A zoom lens for use with an SLR camera the focal length of which is approximately 400 mm at a telephoto end, which has a zoom ratio of two or more, substantially the same brightness as a fixed focus lens, and substantially the same performance and compact... | 08/24/1982 |
| 4336983 | Photographic objective stabilized against change of angular field during focusing A photographic objective having a front lens group movable for focusing and a stationary rear lens group focusing whose back focal point is made coincident with the point of position of the exit pupil of the entire lens system to prevent the change in ang... | 06/29/1982 |
| 4278331 | Photographic objective which prevents variation in angular field of view during focusing The photographic objective optical system disclosed keeps an exit pupil stationary during focusing, thereby rendering it possible to maintain the angle between a ray of light incident upon the entrance pupil and the systems optical axis constant during fo... | 07/14/1981 |
| 4240697 | Lens system having selectively shiftable focal length A zoom lens system is constructed of a focusing member, variator, compensator and an image-forming lens arranged on a common optical axis in this order with respect to incident light to function as a master lens. The image-forming lens is divided into an ... | 12/23/1980 |
| 4157211 | Zoom lens having an easily changeable range of variable focal distance A zoom lens having a lens part for focusing, a zooming part consisting of a plurality of movable lens groups to vary focal distance, and a lens part for imaging in the rear of the zoom lens. The lens part for imaging consists of a front group. A rear grou... | 06/05/1979 |
| 4146305 | Variable lens which can have its focal distance range easily changed A variable magnification lens which can have its focal distance range easily changed and has a focusing lens group, a variable lens group and an imaging lens group positioned in said order from an object side, wherein said imaging lens group has a fixed f... | 03/27/1979 |
| 4099844 | Variable focal lens having a divergent front element Variable focus lens systems having a fixed divergent lens element, a movable convergent lens component, and a basic objective lens group having a fixed lens element and a movable lens component, the movable lens component of the basic objective lens group... | 07/11/1978 |
| 4054371 | Compact varifocal lens system capable of macrophotography A compact varifocal lens system, such as a zoom lens assembly, is provided having a front focusing lens component of negative refractive power, a variator lens component of positive refractive power, a compensator lens component of negative refractive pow... | 10/18/1977 |
| 3972591 | Greatly variable magnification zoom lens system of large aperture ratio Attention has been directed to the fact that in zoom objective lens systems, the compensator for compensating the focal point shift caused by the zoom movement of the variator has generally two solution curves. A novel zooming mechanism such that the comp... | 08/03/1976 |
