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Class Information
Number: 340/384.72
Name: Communications: electrical > Audible indication > Electronic > Plural generators
Description: Subject matter comprising a plurality of oscillators for generating audio frequency signals at different operating frequencies or means for producing multi-tone audible sounds.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7528701 |
Efficiency audible alarm |
May. 5, 2009 |
| 7091832 |
Acoustic detection of machinery malfunction |
Aug. 15, 2006 |
| 7006641 |
Driving circuit, electro-mechanical-acoustic transducer, and portable terminal apparatus |
Feb. 28, 2006 |
| 6885295 |
Reversing alarm |
Apr. 26, 2005 |
| 6788188 |
Multi-function electronic horn warning system |
Sep. 7, 2004 |
| 6701094 |
Battery-powered IR transmitter having constant power output |
Mar. 2, 2004 |
| 6686833 |
Compound acoustic actuator drive circuit and portable information terminal |
Feb. 3, 2004 |
| 6617966 |
Compound acoustic actuator drive circuit and portable information terminal |
Sep. 9, 2003 |
| 6559758 |
Multi-tone warning sounder |
May. 6, 2003 |
| 6396402 |
Method for detecting, recording and deterring the tapping and excavating activities of woodpeckers |
May. 28, 2002 |
| 6359549 |
Electronic sound generator with enhanced sound |
Mar. 19, 2002 |
| 6255937 |
Notifying device using alternating drive signals |
Jul. 3, 2001 |
| 6211774 |
Electronic horn and method for mimicking a multi-frequency tone |
Apr. 3, 2001 |
| 6198405 |
Driver circuit and method of operating the same |
Mar. 6, 2001 |
| 6160245 |
Variable volume signaling device for an appliance |
Dec. 12, 2000 |
| 5939992 |
Safety apparatus for electric appliances |
Aug. 17, 1999 |
| 5818328 |
Method and system for providing improved wireless audio transmission |
Oct. 6, 1998 |
| 5726634 |
Smoke alarm with high and low pitched tones |
Mar. 10, 1998 |
| 5714926 |
Method and means for preventing trespassing |
Feb. 3, 1998 |
| 5675312 |
Piezoelectric warbler |
Oct. 7, 1997 |
| 5675311 |
Frequency sweeping audio signal device |
Oct. 7, 1997 |
| 5619179 |
Method and apparatus for enhancing electronically generated sound |
Apr. 8, 1997 |
| 5416463 |
Method and apparatus for producing a sound from a handheld enclosure |
May. 16, 1995 |
| 5283567 |
Prize holding container assemblies |
Feb. 1, 1994 |
| 5175528 |
Double oscillator battery powered flashing superluminescent light emitting diode safety warning light |
Dec. 29, 1992 |
| 5084695 |
Umpire's counter |
Jan. 28, 1992 |
| 5012221 |
Emergency vehicle audible warning system and method |
Apr. 30, 1991 |
| 4949068 |
Motorcycle sound simulator for a child's toy |
Aug. 14, 1990 |
| 4812746 |
Method of using a waveform to sound pattern converter |
Mar. 14, 1989 |
| 4719452 |
Audio signal generator |
Jan. 12, 1988 |
| 4689609 |
Electronic horn with spiral deflecting walls coupled to a truncated cone structure |
Aug. 25, 1987 |
| 4665383 |
Security system with monitoring and warning circuits |
May. 12, 1987 |
| 4646063 |
Electronic siren with remote multiplexed control head |
Feb. 24, 1987 |
| 4631517 |
Frequency-matched signal device for persons with impaired hearing |
Dec. 23, 1986 |
| 4626799 |
Warble signaling device |
Dec. 2, 1986 |
| 4567806 |
Sound generator |
Feb. 4, 1986 |
| 4558305 |
Multiple tone signaling device |
Dec. 10, 1985 |
| 4554411 |
Intercom system |
Nov. 19, 1985 |
| 4516113 |
Digital tone generator for tone sequences |
May. 7, 1985 |
| 4488145 |
Resonant sounder device for producing multiple warning sounds |
Dec. 11, 1984 |
| 4486742 |
Multifrequency piezoelectric horn system |
Dec. 4, 1984 |
| 4473821 |
Personal acoustic alarm system |
Sep. 25, 1984 |
| 4437088 |
Electrical simulation of percussive bell |
Mar. 13, 1984 |
| 4421952 |
Multi-frequency busy signal synthesizing circuitry |
Dec. 20, 1983 |
| 4401975 |
Electrical synthesis of mechanical bell |
Aug. 30, 1983 |
| 4363028 |
Electronic siren |
Dec. 7, 1982 |
| 4338593 |
Rodent control apparatus and method |
Jul. 6, 1982 |
| 4337460 |
Hand-held sound effects device |
Jun. 29, 1982 |
| 4303908 |
Electronic sounder |
Dec. 1, 1981 |
| 4293851 |
Sound actuator |
Oct. 6, 1981 |
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