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Patent US4947114A successfully refreshed from Google Patents.
US4947114A
Expired / Lapsed
US
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Method of marking semiconductor chips and markable semiconductor chip
Assignee: Siemens AG
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Filing: 1982-05-24
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Granted: 1990-08-07
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Expires: 2002-05-24
Abstract
Abstract Method of marking semiconductor chips to indicate at least one definite feature by applying optically recognizable markings to the surface of the semiconductor chips, which includes forming at least one area of the chip provided for marking purposes from a homogeneous and highly reflective material, and applying the optically recognizable markings by changing the surface of the at least one area of the chip provided for making purposes, and a chip which is markable according to the method.
Inventors
- 👤 Gunter Schindlbeck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:01
CPC Classifications
H; H10; H10W; H10W46/00; H10W46/601
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
45 words
Semiconductor chip, comprising a semiconductor substrate having a surface, at least one metal contact-type surface disposed on the surface of the substrate, and optically recognizable markings applied to said at least one metal contact-type surface for indicating at least one definite feature of the chip.
Claim 2
Dependent Claim
45 words
Semiconductor chip, comprising a semiconductor substrate having a surface, at least one metal contact-type surface disposed on the surface of the substrate, and optically recognizable markings applied to said at least one metal contact-type surface for indicating at least one definite feature of the chip.
Claim 3
Dependent Claim
17 words
Semiconductor chip according to claim 1, wherein said at least one metal contact-type surface is a metallization.
Claim 4
Dependent Claim
18 words
Semiconductor chip according to claim 1, wherein said at least one metal contact-type surface is polycrystalline semiconductor material.
References Cited (Backward Citations)
US4219827A
Cited
DE3014127A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-08-06 | 1994-02-05 | 1994-08-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-08-06 | 1998-02-05 | 1998-08-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-08-06 | 2002-02-05 | 2002-08-07 | $7700.00 | Window Closed / Lapsed |