US4359697A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ultrasonic wave nebulizer driving circuit
Assignee: TDK Corp
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Filing: 1981-08-21
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Granted: 1982-11-16
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Expires: 2001-08-21
Abstract
Abstract Positive feedback is applied from the piezo-electric vibrator in an ultrasonic nebulizer to the control electrode in the oscillator circuit for improved performance.
Inventors
- 👤 Minoru Takahashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 20:07
CPC Classifications
B; B05; B05B; B05B17/00; B05B17/04; B05B17/06; B05B17/0607; B06; B06B; B06B1/00; B06B1/02; B06B1/0207; B06B1/0223; B06B1/0238; B06B1/0246; B06B1/0253; B06B2201/00; B06B2201/50; B06B2201/55; B06B2201/70; B06B2201/77
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
91 words
In an ultrasonic nebulizer driving circuit that includes an oscillator for generating a high frequency signal to energize a piezo-electric vibrator that generates ultrasonic waves, said oscillator including a control element having a control electrode, means including a bias resistor for supplying a biasing current to said control electrode, the improvement comprising a positive feedback circuit to feed back a part of said high frequency signal to said control electrode independent of said bias resistor to supplement said biasing current and concomitantly enable said bias resistor to be reduced in wattage.
Claim 2
Dependent Claim
91 words
In an ultrasonic nebulizer driving circuit that includes an oscillator for generating a high frequency signal to energize a piezo-electric vibrator that generates ultrasonic waves, said oscillator including a control element having a control electrode, means including a bias resistor for supplying a biasing current to said control electrode, the improvement comprising a positive feedback circuit to feed back a part of said high frequency signal to said control electrode independent of said bias resistor to supplement said biasing current and concomitantly enable said bias resistor to be reduced in wattage.
Claim 3
Dependent Claim
36 words
A circuit as in claim 1, wherein said feedback circuit comprises a capacitive pickup and resistive divider network coupled to said vibrator to develop a high frequency signal corresponding to the signal applied to said vibrator.
Claim 4
Dependent Claim
23 words
A circuit as in claim 2, including a diode element for coupling said capacitive pickup and resistive divider network to said control electrode.
Claim 5
Dependent Claim
13 words
A circuit as in claim 3, wherein said control element is a transistor.
Claim 6
Dependent Claim
16 words
A circuit as in claim 4, wherein said control electrode is the base of said transistor.
Claim 7
Dependent Claim
24 words
A circuit as in claim 5, wherein said diode is poled so as to increase in a negative sense the potential of said base.
Claim 8
Dependent Claim
19 words
A circuit as in claim 6, wherein said vibrator is coupled to the base and emitter of said transistor.
Claim 9
Dependent Claim
17 words
A circuit as in claim 7, wherein said vibrator is transformer coupled to said base and emitter.
Claim 10
Dependent Claim
19 words
A circuit as in claim 1, wherein said piezo-electric vibrator constitutes one of the oscillation elements of said oscillator.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-11-15 | 1986-05-17 | 1986-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-11-15 | 1990-05-17 | 1990-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-11-15 | 1994-05-17 | 1994-11-16 | $7700.00 | Window Closed / Lapsed |