Did You Know...
...that while attempting to develop a super strong glue, 3M employee Spencer Silver accidentally developed a glue that was so weak it would barely hold two pieces of paper together? However, his colleague Art Fry needed the glue. Fry sang with his church choir and marked the pages of his hymnal with small scraps of paper that often fell out. He used Silver's glue to hold the papers in place. Today we call this invention Post-it Notes.
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| Number | Title | Issue Date |
| 4031492 | Triple break current limiter A current limiter providing for a rapid triple series break in the protected circuit. Two movable contact arms are electromagnetically driven apart by two electromagnetic or slot motor drives for rapid circuit interruption when current through the current... | 06/21/1977 |
| 4028793 | Method of assembling helical resistor A power resistor including a resistance element of metal ribbon formed into an edgewound helix, and an internal three-point support structure axially disposed within the interior of the helix. The support structure includes three insulating assemblies eac... | 06/14/1977 |
| 3999155 | Circuit interrupter including a current-limiting reactor A circuit interrupter including a multipole circuit breaker and a multipole current-limiting reactor device. The multipole current-limiting reactor device includes an insulating housing forming a plurality of compartments, each compartment having a double... | 12/21/1976 |
| 3991291 | Enclosed circuit interrupter with door mounted control handle mechanism A handle mounted externally on the door of a sealed enclosure operates a mechanism on the inner side of the door which controls the opening and closing of a circuit breaker located within the enclosure. The handle has a detented OPEN and AUTO position and... | 11/09/1976 |
| 3991292 | Dual compression puffer interrupter A fluid-blast circuit interrupter of the puffer type is provided having two pistons connected in tandem to compress arc-extinguishing fluid in two separate volumes and to produce two separate fluid blasts. Valve action is provided to delay the initiation ... | 11/09/1976 |
| 3989986 | Metal enclosed switchgear having well-shaped front covers Each section of a three-phase metal enclosed switchgear unit is provided with main through horizontal bus and vertical section bus. The front of each switchgear section is divided into vertically disposed enclosures for housing circuit breakers or circuit... | 11/02/1976 |
| 3983460 | Enclosed circuit interrupter with improved fuse assembly A network protector includes an automatic circuit breaker mounted in a metal enclosure and a fuse assembly externally mounted upon the enclosure. The fuse assembly includes a fuse housing of molded insulating material and a gasketed access plate providing... | 09/28/1976 |
| 3983454 | Distribution transformer secondary circuit breaker A distribution transformer having a secondary circuit breaker utilizing a movable bridging contact between two stationary contacts for completing a series circuit therethrough. The movable bridging contact is spring biased towards an open position separat... | 09/28/1976 |
| 3978300 | Low-voltage circuit-breaker having small contact separation and small gap between cooperating parallel-arranged arcing-rails An improved low-voltage circuit-breaker, adaptable for both alternating-current and direct-current is provided having small contact separation, when opened, and a pair of adjoining arcing-rails arranged in generally-parallel relationship, and having only ... | 08/31/1976 |
| 3978304 | Enclosed circuit interrupter including externally operable handle mechanism A molded case circuit breaker enclosed in a metal cabinet with an openable cover. An operating mechanism has a mounting plate secured to the face of the circuit breaker and a sliding plate movably supported on rollers by the mounting plate at the side of ... | 08/31/1976 |
| 3975701 | Circuit breaker with one-way adjustment of tripping current level A molded case circuit breaker having a solid-state trip unit adjustable over a variety of ratings. One-way adjustment is provided, permitting a reduction in the rating of the circuit breaker and preventing an increase in the rating. A ratchet mechanism an... | 08/17/1976 |
| 3967192 | Indicator lamp test circuit utilizing bidirectional thyristor switching A circuit is provided for test and operation of indicator lights wherein multiple lights may be tested simultaneously by pushing one button and closing one set of normally open contacts and the individual indicator lights are operated from a circuit utili... | 06/29/1976 |
| 3956605 | Fluid blast circuit interrupter with a compact nozzle structure and versatile operating mechanism A fluid blast circuit interrupter is provided having a pair of compact toroidal-shaped nozzles, steady-state current-carrying contacts, arc-establishing contacts, and a blast valve. A rotatable cam plate provides independent actuation of the steady-state ... | 05/11/1976 |
| 3950714 | Self-adjusting circuit breaker with rotating trip assembly A molded case circuit breaker is described including a U-shaped thermal and magnetic trip assembly pivotally supported by an insulating housing. A compression spring biases the trip assembly against a releasable cradle which is engaged by a latch. The bia... | 04/13/1976 |
| 3940664 | Multi-phase voltage sensing switching device The disclosure describes a device for detecting undervoltage conditions on multi-phase alternating current circuits which senses the voltage on the phase having the highest instantaneous positive voltage. A differential between pickup and dropout voltage ... | 02/24/1976 |
| 3932715 | High voltage switch A high voltage switch including a rotatable insulating column adjusted by means of an operating arm assembly including two bolt circles of equal radius and unequal spacing.... | 01/13/1976 |
