Patent US5590787A successfully refreshed from Google Patents.
US5590787A
Expired / Lapsed
US
⏱️ 0.0 years remaining
UV light sensitive die-pac for securing semiconductor dies during transport
Assignee: Micron Technology Inc
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Filing: 1995-01-04
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Granted: 1997-01-07
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Expires: 2015-01-04
Abstract
Abstract A structure for protecting semiconductor integrated microcircuit dice during shipping. The structure secures the position of the die atop an ultra-violet (UV) light penetratable plate using a UV light sensitive adhesive layer. Once the structure reaches its destination, prior to removal of the die, the adhesive layer is exposed to ultraviolet light. This exposure reduces the adhesiveness or coefficient of friction of the layer, thereby facilitating die removal from the structure. The UV sensitive adhesive does not leave contaminating silicon residue on the removed die. The invention may be realized using currently commercially available UV tape and a modified die-pac having a UV light penetratable window.
Inventors
- 👤 Joe Hodges
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 09:41
CPC Classifications
H; H10; H10P; H10P72/00; H10P72/10; H10P72/19; H10P72/1902; H10P72/18; H10P72/1904; H10P72/70; H10P72/74; H10P72/741
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
83 words
A structure for releasably holding a microcircuit die which comprises: a plate having an upper face and formed from a material which is penetrable to light; and a layer of adhesive over a section of said upper face, said layer of adhesive having a coefficient of friction sensitive to light, whereby a die held in a fixed position with respect to said upper face by said layer of adhesive may be released by exposing said layer of adhesive to light through said section.
Claim 2
Dependent Claim
83 words
A structure for releasably holding a microcircuit die which comprises: a plate having an upper face and formed from a material which is penetrable to light; and a layer of adhesive over a section of said upper face, said layer of adhesive having a coefficient of friction sensitive to light, whereby a die held in a fixed position with respect to said upper face by said layer of adhesive may be released by exposing said layer of adhesive to light through said section.
Claim 3
Dependent Claim
17 words
The structure of claim 1, further comprising: a cover extending from said plate for enclosing the die.
Claim 4
Dependent Claim
20 words
The structure of claim 1, wherein the light is ultraviolet light having a wavelength of between 250 and 350 nanometers.
Claim 5
Dependent Claim
26 words
The structure of claim 1, further including a length of tape having an undersurface secured above said upper face and a top surface carrying said adhesive.
Claim 6
Dependent Claim
27 words
The structure of claim 4, further including a layer of resilient webbing interposed between said undersurface and said upper face, said webbing being penetrable by the light.
Claim 7
Dependent Claim
14 words
The structure of claim 5, wherein said layer of resilient webbing consists of nylon.
Claim 8
Dependent Claim
58 words
The structure of claim 1, which further comprises: a first bed having a portion consisting of said plate; a vessel which comprises: top, bottom and side walls defining an inner cavity; said inner cavity sized and dimensioned to accept said first bed therein; and means for releasably holding said first bed in a fixed position within said cavity.
Claim 9
Dependent Claim
59 words
The structure of claim 7, wherein said means for releasably holding said first bed comprise: said first bed having opposite ends; said vessel having a pair of said side walls having opposite facing inner surfaces; a first groove set into each of said inner surfaces; and said first grooves being sized and dimensioned to releasably engage said opposite ends.
Claim 10
Dependent Claim
31 words
The structure of claim 8, which further comprises: a second bed identical to said first bed; and means for releasably holding said second bed in a fixed position within said cavity.
Claim 11
Dependent Claim
29 words
The structure of claim 9, wherein said means for releasably holding said second bed comprise a second groove set into each of said inner surfaces below said first groove.
Claim 12
Dependent Claim
101 words
A package for shipping at least one die, said package comprising: a bed including at least a portion formed of a material penetrable by ultraviolet light; a cover releasably mated to said bed and defining an inner chamber therewith, said inner chamber sized and dimensioned to accept at least one die therein; and a layer of adhesive secured over a surface of said portion of said bed for releasably holding at least one die in a fixed position within said inner chamber, said adhesive having a first adhesiveness alterable to a second adhesiveness by exposure of said adhesive to ultraviolet light.
Claim 13
Dependent Claim
101 words
A package for shipping at least one die, said package comprising: a bed including at least a portion formed of a material penetrable by ultraviolet light; a cover releasably mated to said bed and defining an inner chamber therewith, said inner chamber sized and dimensioned to accept at least one die therein; and a layer of adhesive secured over a surface of said portion of said bed for releasably holding at least one die in a fixed position within said inner chamber, said adhesive having a first adhesiveness alterable to a second adhesiveness by exposure of said adhesive to ultraviolet light.
Claim 14
Dependent Claim
18 words
The structure of claim 11, wherein the ultraviolet light has a wavelength of between 250 and 350 nanometers.
References Cited (Backward Citations)
US3645281A
Cited
US3695414A
Cited
US4251712A
Cited
US4478331A
Cited
US5025923A
Cited
US5158818A
Cited
US5025922A
Cited
US5064064A
Cited
US5054610A
Cited
US5234105A
Cited
US5234104A
Cited
US5447784A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2000-01-07 | 2000-07-08 | 2001-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-01-07 | 2004-07-08 | 2005-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-01-07 | 2008-07-08 | 2009-01-07 | $7700.00 | Window Closed / Lapsed |