Patent US5008733A successfully refreshed from Google Patents.
US5008733A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Semiconductor device
Assignee: DuPont Toray Specialty Materials KK
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Filing: 1988-02-26
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Granted: 1991-04-16
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Expires: 2008-02-26
Abstract
Abstract A semiconductor device (1) in which a heat-bondable cured silicone (7) is applied and heat-bonded to the surface of only a predetermined principal portion of the semiconductor device so as not to contact bonding wires (3), flip chip solder portions (8) or beam leads, in order to protect the surface of the principal portion, and a seal layer (6) or (10) is provided after the heat bonding of the cured silicone. The cured silicone (7) is preferably in the form of a film, and a heat-resistant base material (12) may be laminated to one side of the cured silicone. Breaking of bonding wires (3), cracking of solder portions (8) and separation of beam leads do not occur because only the portion to be protected can be protected by coating with the cured silicone (7) and the portion not to be protected is not so coated. Moreover, sisnce there is no contamination caused by a silicone exhalation, the occurrence of a defective bonding and the separation of a sealing resin can be prevented. The seal layers (6 ) and (10) are each constituted by a hermetic seal or a resin seal.
Inventors
- 👤 Katsutoshi Mine
- 👤 Yoshitsugu Morita
- 👤 Satoshi Miyamae
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 12:36
CPC Classifications
H; H10; H10W; H10W76/00; H10W76/10; H10W76/12; H10W76/15; H10W76/157; H10W74/00; H10W74/10; H10W74/111; H10W74/121; H10W74/131; H10W74/137; H10W72/00; H10W72/01; H10W72/015; H10W72/01515; H10W72/071; H10W72/075; H10W72/50; H10W72/521; H10W72/522; H10W72/531; H10W72/5363; H10W72/551; H10W72/552; H10W72/5522; H10W72/5524; H10W90/00; H10W90/701; H10W90/721; H10W90/724; H10W90/751; H10W90/756
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
39 words
A process for forming a semiconductor device having a protective coating which comprises applying a heat-bondable, previously cured silicone to at least a major portion of the surface of the semiconductor device and heat-bonding the silicone to said surface.
Claim 2
Dependent Claim
39 words
A process for forming a semiconductor device having a protective coating which comprises applying a heat-bondable, previously cured silicone to at least a major portion of the surface of the semiconductor device and heat-bonding the silicone to said surface.
Claim 3
Dependent Claim
39 words
The process device as set forth in claim 1, which is a wire bonding type semiconductor device with said heat-bondable cured silicone applied and heat-bonded to the surface of at least a principal portion thereof without contacting bonding wires.
Claim 4
Dependent Claim
38 words
The semiconductor device as set forth in claim 1, which is a flip chip type semiconductor device with said heat-bonded cured silicone applied and heat-bonded to the surface of at least a principal portion thereof without contacting solder.
Claim 5
Dependent Claim
39 words
The process device as set forth in claim 1, which is a beam lead type semiconductor device with said heat-bondable cured silicone applied and heat-bonded to the surface of at least a principal portion thereof without contacting beam leads.
Claim 6
Dependent Claim
31 words
The process device as set forth in any one of claims 2, 3 and 4, wherein said principal portion of the semiconductor device is a principal portion of a semiconductor chip.
Claim 7
Dependent Claim
20 words
The process device as set forth in claim 1, wherein said heat-bondable cured silicone is a heat-bondable silicone rubber film.
Claim 8
Dependent Claim
28 words
The process device as set forth in claim 6, wherein the thickness of said heat-bondable silicone rubber film is in the range of 30 microns to 1 millimeter.
Claim 9
Dependent Claim
20 words
The process device as set forth in claim 1, wherein said heat-bondable cured silicone is a heat-bondable silicone resin film.
Claim 10
Dependent Claim
28 words
The process device as set forth in claim 8, wherein the thickness of said heat-bondable silicone resin film is in the range of 30 microns to 1 millimeter.
Claim 11
Dependent Claim
24 words
The process device as set forth in claim 1, wherein a heat-resistant base material is laminated to one side of said heat-bondable cured silicone.
Claim 12
Dependent Claim
26 words
The process device as set forth in claim 10, wherein the thickness of said heat-resistant base material is in the range of 1 to 100 microns.
Claim 13
Dependent Claim
19 words
The process device as set forth in claim 10, wherein said heat-resistant base material is a heat-resistant plastic film.
Claim 14
Dependent Claim
18 words
The process device as set forth in claim 12, wherein said heat-resistant plastic film is a polyimide film.
Claim 15
Dependent Claim
27 words
The process device as set forth in claim 1, wherein said heat-bondable cured silicone is a cured silicone having silicon atom-bonded hydrogen atoms in a cured state.
Claim 16
Dependent Claim
56 words
The process device as set forth in claim 14, wherein said cured silicone is a cured product of a composition which contains as main components a vinyl group-containing organopolysiloxane, an organohydrogen polysiloxane and a platinum compound catalyst and in which silicon atom-bonded hydrogen atoms are present in a large excess relative to silicon atom-bonded vinyl groups.
References Cited (Backward Citations)
US3939488A
Cited
US4331970A
Cited
GB2036428A
Cited
JPS55140249A
Cited
US4626556A
Cited
DE3222791A1
Cited
JPS5947745A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-04-15 | 1994-10-15 | 1995-04-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-04-15 | 1998-10-15 | 1999-04-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-04-15 | 2002-10-15 | 2003-04-16 | $7700.00 | Window Closed / Lapsed |