Did You Know...
...that Kleenex tissue was originally designed to be a gas mask filter? It was developed at the beginning of World War I to replace cotton, which was then in short supply as a surgical dressing.
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| Number | Title | Issue Date |
| 6559367 | Electronic windchime device The present invention offers an adjustable, versatile windless windchime activation device, which can be modified to accept and activate many different varieties of windchime assemblies. The magnetic repulsive force between an electromagnet located within... | 05/06/2003 |
| 6549109 | Magnet-sensible triggering doorbell mechanism A doorbell mechanism includes a triggering board and a main body of a conventional doorbell. The triggering board has a magnet-sensible device and a decorative doorknocker. The magnet-sensible device and the decorative doorknocker are respectively provide... | 04/15/2003 |
| 6239692 | Sounder A multi-tone sounder system including the sounder and a method of controlling the sounder in which at least a pair of chime bars (3, 5), bells or gongs are spaced apart and arranged to be struck by a solenoid operated striker (26) positioned between the c... | 05/29/2001 |
| 5909169 | Electric bell having a mechanism for supporting electromagnetic unit An electric bell includes a base having two walls extended upward from the central portion for forming a casing. The walls each includes an upper portion having one or more projections. Two spring leaves are secured on the base. An electromagnetic unit is... | 06/01/1999 |
| 5841343 | Buzzer with rotary volume adjustment A electromechanical buzzer provides a rotational volume control having a flange extending over the armature of the buzzer with a downwardly extending wedge surface reducing the vibrational range of the armature. The wedge surface is oversized so that when... | 11/24/1998 |
| 5596311 | Method and apparatus for driving a self-resonant acoustic transducer A method and system employing a feedback signal indicative of monitored motion of an electro-mechanical acoustic transducer to generate one or both of a control signal for driving the transducer at its natural resonance frequency, and a warning signal ind... | 01/21/1997 |
| 5519375 | Sound generator A gong holder is secured to a resonance box. A first end of each of gong sticks is secured to the gong holder. Solenoid type hammer devices drive rod hammers that are movably disposed in a direction perpendicular to the gong sticks so that the rod hammers... | 05/21/1996 |
| 5457437 | Sparking free circuit of electric horn An electric horn which comprises a diaphragm held at its peripheral portion in a housing of the horn and having an armature attached to a middle portion thereof; an electromagnet having a coil and disposed adjacent to the armature in an opposed relationsh... | 10/10/1995 |
