Famous Patents
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 |
| 6621401 | Self-recovering current limiting device having liquid metal A self-recovering current-limiting device with a liquid metal includes two T-shaped electrodes for connection to an electric circuit to be protected. Each of the electrodes are made of a solid metal. Several compressor cavities which are partially filled ... | 09/16/2003 |
| 6603384 | Self-recovering current-limiting device having liquid metal A self-recovering current-limiting device having liquid metal includes solid metal electrodes for connecting to an external electric circuit to be protected. A plurality of compression spaces which are partially filled with liquid metal are arranged one b... | 08/05/2003 |
| 6600405 | Self-regenerating current limter with liquid metal A self-regenerating current limiter with liquid metal includes solid metal electrodes for connection of the current limiter to an electric circuit to be protected. A plurality of compression chambers that are partially filled with liquid metal are located... | 07/29/2003 |
| 5231368 | Temperature operated switch construction, terminal block therefor and methods of making the same A temperature operated switch construction, terminal block therefor and methods of making the same are provided, the switch construction comprising a housing, a movable switch arm carried in the housing, a temperature actuated unit disposed in the housing... | 07/27/1993 |
| 5200732 | Temperature operated switch construction, terminal block therefor and methods of making the same A temperature operated switch construction, terminal block therefor and methods of making the same are provided, the switch construction comprising a housing, a movable switch arm carried in the housing, a temperature actuated unit disposed in the housing... | 04/06/1993 |
| 5166657 | Temperature operated switch construction and method of making the same A temperature operated switch construction, terminal block therefor and methods of making the same are provided, the switch construction comprising a housing, a movable switch arm carried in the housing, a temperature actuated unit disposed in the housing... | 11/24/1992 |
| 5148142 | Temperature operated switch construction, terminal block therefor and methods of making the same A temperature operated switch construction, terminal block therefor and methods of making the same are provided, the switch construction comprising a housing, a movable switch arm carried in the housing, a temperature actuated unit disposed in the housing... | 09/15/1992 |
| 4419650 | Liquid contact relay incorporating gas-containing finely reticular solid motor element for moving conductive liquid It has been discovered that electrically conducting, vitreous pyrolytic carbon in broken-bubble, foam-type, reticulated structures can be used as an extremely fast and efficient electrically operated motor to actuate mechanical devices, such as mercury li... | 12/06/1983 |
| 4281307 | Thermal cut-off fuse A thermal cut-off fuse of a self-restoring type, which breaks the electric continuity between a pair of lead wires in response to melting and voluminal expansion of a temperature-sensitive member upon rise of the ambient temperature to a prescribed temper... | 07/28/1981 |
| 3987388 | Current limiting device A current limiting device includes a duct containing a current-limiting material therein which serves to interconnect two spaced terminals but which is evaporable when subjected to an over-current flowing through the material between the terminals. The wa... | 10/19/1976 |
