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 |
| 7112946 | Transformer with selectable input to output phase angle relationship A three-input induction transformer in which the phase relationship of the power output relative to the power input is selectable/adjustable after the transformer is placed in operation in the field. The transformer includes a primary set of windings and a three-pol... | 09/26/2006 |
| 6404320 | Method for adjusting the inductance of an inductor Disclosed is a method for adjusting the inductance of an inductor at least including a bobbin, a first magnetic member having a concavity on a side wall thereof, and a second magnetic member having a protrusion at a first end thereof for preventing the se... | 06/11/2002 |
| 4678927 | Circuit arrangement for large power transformers A circuit arrangement for large power transformers with a low-voltage winding, a main high-voltage winding and a step winding as well as a step switching device at a Y-point side thereof, includes, at a location between a point connecting the step winding... | 07/07/1987 |
| 4471334 | On-load tap-changing transformer An on-load tap-changing transformer in which its high-voltage winding is axially divided into parallel-connected halves, and an end conductor constituting part of the high-voltage winding is connected to the other terminal of each of the halves. A coarse ... | 09/11/1984 |
| 4253011 | Plastic injection molding system having a temperature controlled electric heater element A plastic injection molding system having a temperature controlled electric heater element. The heater element is formed by disposing a pair of heater wires and a pair of thermocouple wires and a powdered mineral material in a metal sheath which is subjec... | 02/24/1981 |
| 3996546 | Plug for voltage adaptation A dual-voltage electric plug comprising an insulating hollow casing having an opening, a terminal fitting within the casing, said fitting including four conducting terminal pins extending towards the opening in the casing, which four terminal pins are res... | 12/07/1976 |
