Patent US4740249A successfully refreshed from Google Patents.
US4740249A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of treating wafers with fluid
Assignee: CFMT Inc
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Filing: 1986-10-24
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Granted: 1988-04-26
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Expires: 2006-10-24
Abstract
Abstract Disclosed is apparatus for treating semiconductor wafers with fluids. The device comprises a plurality of vessel segments having lateral walls for enclosing the wafers defining open ends. Sealing structure is provided at the ends so that the segments may be serially nested together and engaged with a fluid inlet and a fluid outlet in a wafer treatment fluid flow line. The vessel segments are constructed of material that is inert to the treatment fluids and designed to minimize creation of eddy currents and fluid traps. Fluid flowing through the vessel uniformly contacts the wafers and results in improved and more reproducible pre-diffusion cleaning, rinsing, etc.
Inventors
- 👤 Christopher F. McConnell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:56
CPC Classifications
H; H10; H10P; H10P72/00; H10P72/04; H10P72/0402; H10P72/0406; B; B05; B05C; B05C3/00; B05C3/02; B05C3/09; B05C3/109; B08; B08B; B08B7/00; B08B7/0064; B08B7/0092
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
156 words
A method of treating semiconductor wafers with fluid flow, said method comprising the steps of: a. loading a plurality of wafers into a vessel having lateral walls disposed about an axis parallel to the direction of fluid flow and defining open ends, said vessel having interior walls comprising a fluoropolymer; b. placing said loaded vessel in a wafer treatment fluid flow line including a diffuser on an upstream portion thereof and an extracter on a downstream portion thereof; c. sealing with an elastomeric seal one of said open ends to means communicating with said upstream portion of said flow line; d. sealing the other of said open ends to means communicating with said downstream portion of said flow line; and e. passing sequentially at least two fluids, with an abrupt change there-between, along said upstream portion of said flow line, through said vessel and about said wafers, and along said downstream portion of said flow line.
Claim 2
Independent Claim
156 words
A method of treating semiconductor wafers with fluid flow, said method comprising the steps of: a. loading a plurality of wafers into a vessel having lateral walls disposed about an axis parallel to the direction of fluid flow and defining open ends, said vessel having interior walls comprising a fluoropolymer; b. placing said loaded vessel in a wafer treatment fluid flow line including a diffuser on an upstream portion thereof and an extracter on a downstream portion thereof; c. sealing with an elastomeric seal one of said open ends to means communicating with said upstream portion of said flow line; d. sealing the other of said open ends to means communicating with said downstream portion of said flow line; and e. passing sequentially at least two fluids, with an abrupt change there-between, along said upstream portion of said flow line, through said vessel and about said wafers, and along said downstream portion of said flow line.
Claim 3
Dependent Claim
33 words
The method of claim 1 comprising the additional step of loading, prior to step c, a second plurality of wafers into a second said vessel, and nesting said second vessel with said vessel.
Claim 4
Dependent Claim
44 words
The method of claim 2 wherein one of steps c and d is conducted by pressing together said means communicating with an upstream portion of said fluid flow line, said vessel, and said means communicatioh with a downstream portion of said fluid flow line.
Claim 5
Dependent Claim
44 words
The method of claim 1 wherein one of steps c and d is conducted by pressing together said means communicating with an upstream portion of said fluid flow line, said vessel, and said means communication with a downstream portion of said fluid flow line.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-04-26 | 1991-10-26 | 1992-04-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-04-26 | 1995-10-26 | 1996-04-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-04-26 | 1999-10-26 | 2000-04-26 | $7700.00 | Window Closed / Lapsed |