US4920402A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Integrated circuit device
Assignee: Mitsubishi Electric Corp
•
Filing: 1988-10-03
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Granted: 1990-04-24
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Expires: 2008-10-03
Abstract
Abstract The present invention is directed to an integrated circuit having multilayer structure. In the present invention, dummy elements having no relation to the operation of an integrated circuit are formed on the upper surface of a substrate provided with the integrated circuit by the same material as that for the substrate, to thereby prevent the integrated circuit provided on the substrate from direct and correct observation. As the result, formation arrangement etc. of the integrated circuit cannot be easily analyzed, whereby interests of those contributing to technology development can be sufficiently protected.
Inventors
- 👤 Masao Nakaya
- 👤 Yasutaka Horiba
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 04:20
CPC Classifications
H; H10; H10D; H10D89/00; H10W; H10W42/00; H10W42/40; Y; Y10; Y10S; Y10S257/00; Y10S257/922
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
128 words
An integrated circuit device having multilayer structure, comprising: a substrate; an integrated circuit formed on one major surface of said substrate; an insulating layer formed on said integrated circuit; dummy elements provided on a prescribed region of said insulating layer and formed by the same material as that for said integrated circuit; a protective film formed on said insulating layer to cover said dummy elements; bonding holes formed in the upper surface of said protective film to reach upper surface parts of said integrated circuit through said insulation layer while avoiding said region provided with said dummy elements; and bonding pads formed in said bonding holes to have upper ends exposed from the upper surface of said protective film and lower ends electrically connected to said integrated circuit.
Claim 2
Dependent Claim
128 words
An integrated circuit device having multilayer structure, comprising: a substrate; an integrated circuit formed on one major surface of said substrate; an insulating layer formed on said integrated circuit; dummy elements provided on a prescribed region of said insulating layer and formed by the same material as that for said integrated circuit; a protective film formed on said insulating layer to cover said dummy elements; bonding holes formed in the upper surface of said protective film to reach upper surface parts of said integrated circuit through said insulation layer while avoiding said region provided with said dummy elements; and bonding pads formed in said bonding holes to have upper ends exposed from the upper surface of said protective film and lower ends electrically connected to said integrated circuit.
Claim 3
Dependent Claim
21 words
An integrated circuit device in accordance with claim 1, wherein said substrate is a semiconductor substrate mainly composed of single-crystalline silicon.
Claim 4
Dependent Claim
20 words
An integrated circuit device in accordance with claim 2, wherein said dummy elements are mainly composed of poly crystalline silicon.
Claim 5
Dependent Claim
19 words
An integrated circuit device in accordance with claim 2, wherein said dummy elements are mainly composed of single-crystalline silicon.
Claim 6
Dependent Claim
31 words
An integrated circuit device in accordance with claim 4, wherein said single-crystalline silicon of said dummy elements is formed by monocrystallizing poly crystalline silicon by a laser annealing zone melting method.
Claim 7
Dependent Claim
18 words
An integrated circuit device in accordance with claim 4, wherein said dummy elements are formed by electronic devices.
References Cited (Backward Citations)
US4766516A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-04-23 | 1993-10-23 | 1994-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-04-23 | 1997-10-23 | 1998-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-04-23 | 2001-10-23 | 2002-04-24 | $7700.00 | Window Closed / Lapsed |