US6083811A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for producing thin dice from fragile materials
Assignee: Northrop Grumman Systems Corp
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Filing: 1996-02-07
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Granted: 2000-07-04
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Expires: 2016-02-07
Abstract
Abstract Thin dice of fragile material are formed by making saw cuts in a front surface of a body of fragile material. The saw cuts define the thin dice, and have a depth equal to the desired thickness of the thin dice plus about 1 mil. A support film is then applied to the front surface of the body of fragile material. Using conventional equipment, the back surface of the body of fragile material, opposite the front surface, is ground. The grinding operation reduces the thickness of the body to the desired thickness for the thin dice. Due to the depth of the saw cuts, the grinding process exposes these saw cuts creating the individual thin dice having the desired thickness.
Inventors
- 👤 Alan J. Riding
- 👤 H. Wayne Jones
- 👤 Leonard Pennisi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 18:20
CPC Classifications
H; H10; H10P; H10P72/00; H10P72/70; H10P72/74; H10P54/00; H10P72/7402; H10P72/7416; H10P72/7432
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
87 words
A method of producing thin dice out of a fragile material, comprising: (a) forming grooves in a first surface of a body of fragile material, said body also having a second surface opposite said first surface; (b) applying a support film to said first surface; (c) removing fragile material from said second surface to thin said body, said step (c) removing enough of said fragile material from said second surface to expose said grooves and form a plurality of thin dice; and (d) removing said support film.
Claim 2
Independent Claim
87 words
A method of producing thin dice out of a fragile material, comprising: (a) forming grooves in a first surface of a body of fragile material, said body also having a second surface opposite said first surface; (b) applying a support film to said first surface; (c) removing fragile material from said second surface to thin said body, said step (c) removing enough of said fragile material from said second surface to expose said grooves and form a plurality of thin dice; and (d) removing said support film.
Claim 3
Dependent Claim
20 words
The method of claim 1, wherein said step (a) forms said grooves by making saw cuts in said first surface.
Claim 4
Dependent Claim
14 words
The method of claim 1, wherein said step (b) applies a non-metallic support film.
Claim 5
Dependent Claim
24 words
The method of claim 1, wherein said step (b) applies a backgrinding film to said first surface, said backgrinding film being a non-contracting film.
Claim 6
Dependent Claim
15 words
The method of claim 4, wherein said step (b) applies several layers of backgrinding film.
Claim 7
Dependent Claim
19 words
The method of claim 1, wherein said step (c) removes said fragile material from said second surface by grinding.
Claim 8
Dependent Claim
28 words
The method of claim 1, wherein said step (d) removes said support film by peeling said support film off said first surface of said plurality of semiconductor dice.
Claim 9
Dependent Claim
67 words
The method of claim 1, wherein said step (d) comprises the substeps of: (d1) applying a handling film to said second surface of said plurality of thin dice, said handling film having greater adhesion to said plurality of thin dice than between said support film and said plurality of thin dice; and (d2) peeling said support film off said first surface of said plurality of thin dice.
Claim 10
Dependent Claim
86 words
The method of claim 1, wherein said step (b) applies a backgrinding film to said first surface, said backgrinding film being a non-contracting film; and said step (d) includes the substeps of, (d1) applying a handling film to said second surface of said plurality of thin dice, said handling film having greater adhesion to said plurality of thin dice than between said backgrinding film and said plurality of thin dice; and (d2) peeling said backgrinding film off said first surface of said plurality of thin dice.
Claim 11
Dependent Claim
15 words
The method of claim 1, wherein said body of fragile material is a semiconductor wafer.
Claim 12
Dependent Claim
21 words
The method of claim 1, wherein said body of fragile material is a body of one of quartz, sapphire, and ceramic.
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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) | 2003-07-04 | 2004-01-03 | 2004-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2007-07-04 | 2008-01-03 | 2008-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2011-07-04 | 2012-01-03 | 2012-07-04 | $7700.00 | Window Closed / Lapsed |