US5664497A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Laser symbolization on copper heat slugs
Assignee: Texas Instruments Inc
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Filing: 1995-12-20
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Granted: 1997-09-09
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Expires: 2015-12-20
Abstract
Abstract The invention is to a method of placing symbolization on a heat spreader, used in conjunction with the semiconductor package, through the use of a low powered laser beam. The beam is scanned over the package surface at a preset intensity and for a desired time to change the surface texture of the heat spreader, and to change the reflectivity of the scanned area.
Inventors
- 👤 Edgar R. Zuniga
- 👤 Archie W. Sutton
- 👤 Ray H. Purdom
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 16:48
CPC Classifications
H; H10; H10P; H10P72/00; H10P72/06; H10P72/0614; B; B41; B41M; B41M5/00; B41M5/26; B41M5/267; G; G03; G03C; G03C1/00; G03C1/72; G03C1/725; B41M5/262
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
77 words
A method of placing symbolization on semiconductor devices, comprising the steps of: coating an area to be symbolized with an oxide material; exposing a portion of the oxide material in a desired pattern with a low power Laser beam in the range of 75 kilowatts; and exposing the portion of the oxide material for a period sufficient to change a reflectivity of the portion of the oxide material without burning through the portion of the oxide material.
Claim 2
Independent Claim
77 words
A method of placing symbolization on semiconductor devices, comprising the steps of: coating an area to be symbolized with an oxide material; exposing a portion of the oxide material in a desired pattern with a low power Laser beam in the range of 75 kilowatts; and exposing the portion of the oxide material for a period sufficient to change a reflectivity of the portion of the oxide material without burning through the portion of the oxide material.
Claim 3
Dependent Claim
20 words
The method according to claim 1, further comprising penetrating a plastic coating with the Laser beam to symbolize the area.
Claim 4
Dependent Claim
14 words
The method according to claim 1, wherein the area to be symbolized is metal.
Claim 5
Dependent Claim
11 words
The method according to claim 3, wherein the metal is copper.
Claim 6
Independent Claim
65 words
A method for placing symbolization on a semiconductor device package, comprising the steps of: oxide coating a surface of the package; tracing a desired pattern on the oxide coating with a laser beam in the range of 75 kilowatts; and maintaining the beam on the oxide coating for a time sufficient to change a reflectivity of the oxide coating without burning through the oxide coating.
Claim 7
Independent Claim
65 words
A method for placing symbolization on a semiconductor device package, comprising the steps of: oxide coating a surface of the package; tracing a desired pattern on the oxide coating with a laser beam in the range of 75 kilowatts; and maintaining the beam on the oxide coating for a time sufficient to change a reflectivity of the oxide coating without burning through the oxide coating.
Claim 8
Dependent Claim
21 words
The method according to claim 5, wherein the surface of the package is copper and the oxide coating is cupric oxide.
Claim 9
Dependent Claim
24 words
The method according to claim 5, further comprising the step of penetrating a plastic coating with the laser beam to expose the oxide coating.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2000-09-08 | 2001-03-10 | 2001-09-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-09-08 | 2005-03-10 | 2005-09-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-09-08 | 2009-03-10 | 2009-09-09 | $7700.00 | Window Closed / Lapsed |