US6010316A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Acoustic micropump
Assignee: Leland Stanford Junior University
•
Filing: 1996-01-16
•
Granted: 2000-01-04
•
Expires: 2016-01-16
Abstract
Abstract A micropump in which a fluid is pumped by the interaction of longitudinal acoustic waves and the fluid in the microchannel. The micropump having an acoustical transducer responsive to a high-frequency input and directing a longitudinal acoustic wave into the channel which induces a pressure gradient. The fluid in the channel flowing in the direction of travel of the acoustic wave in the channel.
Inventors
- 👤 Matthew Isaac Haller
- 👤 Butrus Thomas Khuri-Yakub
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 03:08
CPC Classifications
F; F04; F04F; F04F7/00; B; B01; B01L; B01L3/00; B01L3/50; B01L3/502; B01L3/5027; B01L3/50273; F04B; F04B19/00; F04B19/006; B01L2400/00; B01L2400/04; B01L2400/0403; B01L2400/0433; B01L2400/0436; Y; Y10; Y10S; Y10S366/00; Y10S366/04
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
95 words
An acoustic micropump for pumping fluids comprising: a pumping channel having a cross sectional area between 6.25 μm 2 and 2.25 mm 2 for conveying the fluid; and an acoustical transducer responsive to a high-frequency input for generating and directing longitudinal acoustic waves having a frequency between 1 GHz and 1 MHz, respectively, into one end of said channel whereby the longitudinal acoustic waves induce a pressure gradient in fluid disposed in the channel, said pressure gradient forcing the liquid in the channel to flow in the direction of travel of the longitudinal acoustic waves.
Claim 2
Dependent Claim
95 words
An acoustic micropump for pumping fluids comprising: a pumping channel having a cross sectional area between 6.25 μm 2 and 2.25 mm 2 for conveying the fluid; and an acoustical transducer responsive to a high-frequency input for generating and directing longitudinal acoustic waves having a frequency between 1 GHz and 1 MHz, respectively, into one end of said channel whereby the longitudinal acoustic waves induce a pressure gradient in fluid disposed in the channel, said pressure gradient forcing the liquid in the channel to flow in the direction of travel of the longitudinal acoustic waves.
Claim 3
Dependent Claim
21 words
An acoustic micropump as in claim 1 wherein said transducer is configured to focus said longitudinal acoustic waves into said channel.
Claim 4
Dependent Claim
14 words
An acoustic micropump as in claim 2 wherein said transducer is an interdigital transducer.
Claim 5
Dependent Claim
21 words
An acoustic micropump as in claim 1 wherein said transducer includes a lens for focusing longitudinal acoustic waves into said channel.
Claim 6
Dependent Claim
14 words
An acoustic micropump as in claim 4 wherein said lens is a Fresnel lens.
Claim 7
Dependent Claim
14 words
An acoustic micropump as in claim 4 wherein said lens is a classical lens.
Claim 8
Dependent Claim
59 words
An acoustic micropump as in claim 1 wherein said channel opens into a larger space whereby the acoustic wave intensity is higher and acoustic velocity lower before the opening whereby there is a decrease in radiation pressure as the acoustic waves pass through the opening whereby the fluid is caused to flow in the direction of reduced radiation pressure.
Claim 9
Dependent Claim
32 words
An acoustic micropump as in claim 2 wherein the channel is tapered to have an increasing cross-section in the direction of travel of the longitudinal acoustic waves to generate a pressure gradient.
Claim 10
Dependent Claim
30 words
An acoustic micropump as in claim 2 wherein said acoustic transducer generates Lamb waves which travel in a thin member and are mode-converted to longitudinal acoustic waves at the channel.
References Cited (Backward Citations)
US4171852A
Cited
US4282532A
Cited
US4296417A
Cited
US5212988A
Cited
JPH0364700A
Cited
US5525041A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2003-01-03 | 2003-07-05 | 2004-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2007-01-03 | 2007-07-05 | 2008-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2011-01-03 | 2011-07-05 | 2012-01-04 | $7700.00 | Window Closed / Lapsed |