Patent US4774503A successfully refreshed from Google Patents.
Patent US3763385A successfully refreshed from Google Patents.
US3763385A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Modulator apparatus utilizing piezoelectric plates
Assignee: University of Illinois at Urbana-Champaign
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Filing: 1970-08-05
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Granted: 1973-10-02
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Expires: 1990-08-05
Abstract
Abstract A modulator and method for providing uniform increments of fluid in a continuously pulsing manner, is disclosed. The modulator employs the piezoelectric effect to impart peristaltic-like action to a flexible, resilient channel causing fluid contained within that channel to be pulsed from the channel, in the form of substantially uniform increments or slugs. The modulator is employed, for example, in combination with, and to feed fluid sample to, an analytical instrument such as a flame spectrophotometer.
Inventors
- 👤 V Mossotti
- 👤 J Eakin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 11:06
CPC Classifications
F; F04; F04B; F04B43/00; F04B43/08; F04B43/09; F04B43/095; B; B05; B05B; B05B17/00; B05B17/04; B05B17/06; B05B17/0607; B05B9/00; B05B9/03; B05B9/04; B05B9/0403; B05B9/042; B05B9/0426; F04B17/00; F04B17/003
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
72 words
A modulator for providing uniform increments of fluid material, said modulator comprising at least two piezoelectric plates, at least one flexible, resilient tube means positioned so that an intermediate portion of said tube means is interposed between said plates, support means for positioning and holding said plates, said plates being positioned and supported so that peristaltic-like action can be imparted to said tube means when AC voltage is applied to said plates.
Claim 2
Dependent Claim
72 words
A modulator for providing uniform increments of fluid material, said modulator comprising at least two piezoelectric plates, at least one flexible, resilient tube means positioned so that an intermediate portion of said tube means is interposed between said plates, support means for positioning and holding said plates, said plates being positioned and supported so that peristaltic-like action can be imparted to said tube means when AC voltage is applied to said plates.
Claim 3
Dependent Claim
15 words
The modulator of claim 1 wherein said flexible, resilient tube means is a latex tube.
Claim 4
Dependent Claim
20 words
The modulator of claim 1 wherein the inlet portion of said tube means is provided with a partial flow restriction.
Claim 5
Dependent Claim
25 words
The modulator of claim 1 wherein the outlet portion of said tube means is provided with conduit means, said outlet portion being not otherwise restricted.
Claim 6
Dependent Claim
14 words
The modulator of claim 1 comprising three piezoelectric plates and two flexible, resilient, tubes.
Claim 7
Dependent Claim
99 words
A single channel modulator for providing, in a continuously pulsing manner, increments of fluid material, said modulator comprising a pair of piezoelectric plates, a flexible, resilient tube positioned so that an intermediate portion of said tube is interposed between said plates, means for applying an AC voltage to said plates, said modulator being adapted to impart a peristaltic-like action to said flexible, resilient tube when an AC voltage is applied to said plates, whereby when fluid material enters the inlet end of said tube, uniform increments of said fluid material are provided at the outlet end of said tube.
Claim 8
Dependent Claim
99 words
A single channel modulator for providing, in a continuously pulsing manner, increments of fluid material, said modulator comprising a pair of piezoelectric plates, a flexible, resilient tube positioned so that an intermediate portion of said tube is interposed between said plates, means for applying an AC voltage to said plates, said modulator being adapted to impart a peristaltic-like action to said flexible, resilient tube when an AC voltage is applied to said plates, whereby when fluid material enters the inlet end of said tube, uniform increments of said fluid material are provided at the outlet end of said tube.
References Cited (Backward Citations)
US2902251A
Cited
US3150592A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-01 | 1977-04-02 | 1977-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-01 | 1981-04-02 | 1981-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-01 | 1985-04-02 | 1985-10-02 | $7700.00 | Window Closed / Lapsed |