US4894956A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus and method for slicing a wafer
Assignee: Tokyo Semitsu Co Ltd
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Filing: 1989-04-28
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Granted: 1990-01-23
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Expires: 2009-04-28
Abstract
Abstract In an apparatus and a method for slicing a cylindrical semiconductor ingot into thin wafer pieces using an inner peripheral sliding blade, a grind stone shaft with a grind stone mounted to the tip end thereof is located movably axially within a rotor provided with the inner perpheral sliding blade so that the grind stone shaft and rotor can be rotated integrally but axially movable relative to each other. the grind stone and slicing blade are arranged effieciently so that, after the semiconductor ingot is sliced with the slicing blade, the grind stone approaches the end face of the ingot to grind it. This can save a lapping step, thereby improving working efficiency.
Inventors
- 👤 Katsuo Honda
- 👤 Susumu Sawafuji
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 16:57
CPC Classifications
B; B28; B28D; B28D5/00; B28D5/02; B28D5/022; B28D5/028; B24; B24B; B24B27/00; B24B27/06; B24B7/00; B24B7/20; B24B7/22; B24B7/228; B28D1/00; B28D1/003; H; H10; H10P; H10P54/00
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
85 words
A wafer slicing method comprising the steps: locating an inner periphery slicing blade and a grind stone coaxially with each other; rotating a cylindrical-shaped material and moving it outwardly in the radial direction of said inner periphery slicing blade so as to slice said material into thin pieces; and, matching the axis of said cylindrical-shaped material with the annular grinding section of said cup-shaped grind stone and then grinding the sliced end of said cylindrical-shaped material with said grind stone while rotating said cylindrical material.
Claim 2
Dependent Claim
85 words
A wafer slicing method comprising the steps: locating an inner periphery slicing blade and a grind stone coaxially with each other; rotating a cylindrical-shaped material and moving it outwardly in the radial direction of said inner periphery slicing blade so as to slice said material into thin pieces; and, matching the axis of said cylindrical-shaped material with the annular grinding section of said cup-shaped grind stone and then grinding the sliced end of said cylindrical-shaped material with said grind stone while rotating said cylindrical material.
Claim 3
Dependent Claim
51 words
A wafer slicing method as set forth in claim 1, wherein said cylindrical material is fed a predetermined amount in the direction of the thickness of said sliced thin piece before or after the axis of said cylindrial material is matched with said annular grinding section of said cup-shaped grind stone.
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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) | 1993-01-22 | 1993-07-24 | 1994-01-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-01-22 | 1997-07-24 | 1998-01-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-01-22 | 2001-07-24 | 2002-01-23 | $7700.00 | Window Closed / Lapsed |