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 |
| 7267198 | Portable electric grease gun This invention discloses a portable electrical grease gun which relates to electric tool field. The portable electrical grease gun according to the present invention, in which conventional slide block assembly driving structure is replaced by a crank link mechanism.... | 09/11/2007 |
| 7227079 | Weatherproof cover and disconnect switch A weatherproof cover for protecting electrical receptacles from the harsh elements of weather is disclosed herein. This novel weatherproof cover is operable while the electrical receptacle is in use and includes a weatherproof switch that controls power to the recep... | 06/05/2007 |
| 6958456 | Positive locking, trigger grip, external operating handle assembly for network protector enclosures A handle assembly for a network protector where the network protector includes a circuit breaker and a housing assembly, the circuit breaker having a trip bar structured to move between a first position and a second position corresponding to an open and closed posit... | 10/25/2005 |
| 6900400 | Apparatus having an enclosure, at least one circuit breaker and at least one plug receptacle An apparatus having an enclosure, at least one circuit breaker and at least one plug receptacle, in particular on ships to supply containers with electrical energy, the circuit breaker being arranged in the enclosure and the plug receptacle preferably being arranged... | 05/31/2005 |
| 6314236 | Cordless dryer safety interlock system A hair dryer having a heater, a fan positioned to form an air flow that is heated by the heater, a battery and a switch connected in circuit with the fan and the battery. An interlock prevents the switch from closing during the time the hair dryer is inse... | 11/06/2001 |
| 5903219 | Personal security device A personal security device having a box holding a circuit board, a siren, a first jack, a battery holder, a second jack, a switch and a lamp, a control plug for connecting to the first jack to turn off the siren, the control plug being attached with a swi... | 05/11/1999 |
| 5448027 | Safety switched outlet with dead front A switched outlet having a dead front includes a housing, an electrical receptacle mounted in the housing for receiving an electrical plug, a switch mounted in the housing, a handle coupled to the housing and movable between on and off positions, and a sw... | 09/05/1995 |
| 5298701 | Plug and switch interlock including gear and latch assembly A switch enclosure has a receptacle to receive a pin and sleeve plug having a key on the outside of the sleeve. A handle on the outside of the enclosure operates the switch through a gear train. An interlock mechanism has a sliding latch which prevents th... | 03/29/1994 |
| 5212624 | Interlock mechanism for explosion-proof fixture having circuit breaker switch An interlock mechanism operably associated with the plug receptacle of an explosion-proof housing whereby a plug may be inserted into or removed from the receptacle only when electrical current is not delivered to the receptacle. The interlock mechanism c... | 05/18/1993 |
| 4970355 | Safety device in an electrically powered machine, especially a hand-held power tool The electrically powered machine, especially a hand-held power tool, comprises a housing, a cord to supply electrical energy, a switch changable between an "on" and an "off" position, a switch handle for operating the switch to control delivery of the ele... | 11/13/1990 |
| 4764648 | Switch assembly with actuator for sequentially activating two safety switches A safety switch assembly for an electrical appliance to prevent the appliance from being operated unless its door is fully closed and latched. The switch assembly includes a first switch activated by a pivoted lever and a second switch activated by a slid... | 08/16/1988 |
| 4738629 | Electric sockets An electric socket outlet is provided with an outer shutter (20) mounted slidably on the socket fascia (11) and movable between a closed position in which it covers and hides from view the openings (16-18) in the fascia through which the plug pins enter, ... | 04/19/1988 |
| 4482789 | Apparatus for preventing unauthorized use of electrically powered equipment A controlled access socket assembly wherein a locking device prevents unauthorized movement of the actuator of an electric switch that selectively connects and disconnects a source of electrical power to an electrical outlet socket adapted to receive the ... | 11/13/1984 |
| 4442327 | Manually portable start control for electrically powered apparatus Electrically powered apparatus is provided with a remote primary control station from which energization of the apparatus is usually controlled, and a secondary control station, such as a jog control station, which is remote from the primary control stati... | 04/10/1984 |
| 4414440 | Waterproof electrical switch with safety interlock A water-tight housing (80) has a circuit breaker (71) mounted in its interior. A plug receiving structure (70) selectively receives an electrical plug (75). A locking pin (12) is slidably mounted through the housing to engage the electrical plug and under... | 11/08/1983 |
| 4389551 | Probe-actuated guard shield switch A probe-actuated guard-shield switch mechanism automatically disconnects a guard shield to an input terminal of a measurement instrument upon insertion of a guard probe, and reconnects the guard shield upon removal of the guard probe. The mechanism provid... | 06/21/1983 |
| 4335286 | Waterproof electrical switch A waterproof electrical switch or circuit breaker is precluded from being set in the ON position, except after a plug has been inserted into the receptacle and a safety-interlocking mechanism has been activated. Withdrawal of the plug from the receptacle ... | 06/15/1982 |
| 4037184 | Lockout and cover interlock for circuit breaker A molded case multi-pole circuit breaker is provided with a solid state trip unit having removable and replaceable rating plug. A mechanical interlock trips the circuit breaker when a cover portion thereof is opened. This cover portion must be opened to g... | 07/19/1977 |
| 4009474 | Alarm system for electrical receptacles An alarm system for indicating the unauthorized withdrawal of an appliance lead from a wall receptacle includes a spring biased arm extending partly through the ground connector opening of the receptacle against a microswitch. When the plug is in the rece... | 02/22/1977 |
| 3992599 | Interlock for arc chute of circuit maker and breaker A circuit maker and breaker has a removable arc chute for interrupting an arc formed between the movable and stationary contacts. A pivotally movable interlock device is mounted in a cavity in the insulating base of the circuit maker and breaker in the re... | 11/16/1976 |
| 3973818 | Multi-purpose prefabricated electrical installation The invention relates to a prefabricated electrical supply device comprising an earthed conductor duct including a sheath which is formed generally into the shape of a "G", and which preferably contains, on only one side, an electrical insulating member p... | 08/10/1976 |
| 3956674 | Electric furnace with interlocking disconnect panel for electric box A forced-air electric furnace is provided with an electric disconnect block mounted within a recess in the furnace body forming an electric box. The electric box is closed by a cover panel which includes an aperture through which a disconnect block extend... | 05/11/1976 |
