Patent US3826993A successfully refreshed from Google Patents.
US3826993A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for rapidly exciting and sustaining oscillations in a resonant system
Assignee: BRAFTON CORP
•
Filing: 1970-09-18
•
Granted: 1974-07-30
•
Expires: 1990-09-18
Abstract
Abstract Method and apparatus for initiating and sustaining oscillations in a system having a free oscillatory period, comprising an oscillating means (preferably including a relaxation oscillator of the resistor-capacitor type) connected to apply a periodic driving force to the system, the oscillating means having an intrinsic period approximately equal to the period of the system, a detector connected to sense operation of the oscillating means and the oscillations, if any, of the system and to detect a phase difference therebetween, and circuitry with an input connected to the detector, the circuitry connected to the oscillating means to be effective to modify the oscillations of the oscillating means so as to maintain the phase difference within predetermined limits.
Inventors
- 👤 R White
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:31
CPC Classifications
H; H03; H03L; H03L7/00; B; B01; B01D; B01D49/00; B01D49/006; B01D51/00; B01D51/02; B01D51/06; B01D51/08; B06; B06B; B06B1/00; B06B1/02; B06B1/0207; B06B1/0223; B06B1/0238; B06B1/0246; B06B1/0261; B06B2201/00; B06B2201/50; B06B2201/52; B06B2201/53; B06B2201/70
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
163 words
The method for rapidly exciting from a quiescent state and thereafter sustaining oscillations in a high-Q system having a resonant frequency comprising the steps initially and while oscillations of said system are of amplitude insufficient for effective detection, stimulating said system at a frequency approximately equal to said resonant frequency by forces controlled by a driver, said forces being independent of the amplitude of oscillations of said system, and when oscillations of said system have increased to amplitude sufficient for detection, sensing the phase of said system oscillations, comparing the phase of said system oscillations with the phase of oscillations of said driver to form a signal indicative of phase difference between said system oscillations and said driver oscillations, and applying said signal to control said driver and effect a preferred phase relationship between the oscillations of said driver and the oscillations of said system, and forming a waveform indicative of the phase of but independent of the amplitude of said system oscillations.
Claim 2
Independent Claim
163 words
The method for rapidly exciting from a quiescent state and thereafter sustaining oscillations in a high-Q system having a resonant frequency comprising the steps initially and while oscillations of said system are of amplitude insufficient for effective detection, stimulating said system at a frequency approximately equal to said resonant frequency by forces controlled by a driver, said forces being independent of the amplitude of oscillations of said system, and when oscillations of said system have increased to amplitude sufficient for detection, sensing the phase of said system oscillations, comparing the phase of said system oscillations with the phase of oscillations of said driver to form a signal indicative of phase difference between said system oscillations and said driver oscillations, and applying said signal to control said driver and effect a preferred phase relationship between the oscillations of said driver and the oscillations of said system, and forming a waveform indicative of the phase of but independent of the amplitude of said system oscillations.
Claim 3
Dependent Claim
23 words
The method of claim 1 wherein said waveform is a square top wave formed by amplifying and clipping a signal from said system.
Claim 4
Dependent Claim
13 words
The method of claim 2 wherein said system is a mass-spring mechanical vibrator.
Claim 5
Dependent Claim
16 words
The method of claim 3 including the step of exciting with said vibrator a sonic agglomerator.
References Cited (Backward Citations)
US3010073A
Cited
US3197714A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-07-29 | 1978-01-28 | 1978-07-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-29 | 1982-01-28 | 1982-07-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-29 | 1986-01-28 | 1986-07-30 | $7700.00 | Window Closed / Lapsed |