US4822973A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composite plastic with laser altered internal material properties
Assignee: Bayer AG
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Filing: 1987-09-28
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Granted: 1989-04-18
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Expires: 2007-09-28
Abstract
Abstract An identification mark which remains permanently readable is applied by means of a laser beam through a lightwave window of plastics material to a plastics layer situated behind that window.
Inventors
- 👤 Karsten Fahner
- 👤 Hans-Werner Depcik
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:13
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/26; B41M5/267; B23; B23K; B23K26/00; B23K26/0006; B23K2103/00; B23K2103/16; B23K2103/30; B23K2103/42
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
111 words
A composite plastic part of thermoplastic materials having good adhesion and compatability with one another and similar contraction behavior and having material properties altered by a laser beam, the composite plastic part having a thermoplastic surface layer with a layer thickness of from 0.1 to 2 mm, a light transmission value τ of greater than 0.8 and more particularly greater than 0.9 at a wavelength of from 1000 to 20,000 um, and an internal thermoplastic material region below the surface layer with a light absorption value to a depth of 2 mm of greater than 80% of incident laser beams, internal thermoplastic material region containing a subsequently laser induced change therein.
Claim 2
Dependent Claim
111 words
A composite plastic part of thermoplastic materials having good adhesion and compatability with one another and similar contraction behavior and having material properties altered by a laser beam, the composite plastic part having a thermoplastic surface layer with a layer thickness of from 0.1 to 2 mm, a light transmission value τ of greater than 0.8 and more particularly greater than 0.9 at a wavelength of from 1000 to 20,000 um, and an internal thermoplastic material region below the surface layer with a light absorption value to a depth of 2 mm of greater than 80% of incident laser beams, internal thermoplastic material region containing a subsequently laser induced change therein.
Claim 3
Dependent Claim
17 words
A composite plastic part as in claim 1 wherein the internal thermoplastic material region contains metallic inclusions.
Claim 4
Dependent Claim
17 words
A composite plastic part as in claim 1 wherein the internal thermoplastic material region consists of polyacrylonitrile.
Claim 5
Dependent Claim
30 words
A composite plastic part as in claim 1 wherein the subsequently laser induced change in the internal thermoplastic material region is in the form of a carbonized electrically conductive path.
Claim 6
Dependent Claim
30 words
A composite plastic part as in claim 3 wherein the subsequently laser induced change in the internal thermoplastic material region is in the form of a carbonized electrically conductive path.
Claim 7
Dependent Claim
32 words
A composite plastic part as in claim 1 wherein one thermoplastic material is cellulose acetate and the other thermoplastic material is at least one of acrylonitrile-butadiene-styrene, cellulose acetate and ethylene vinyl acetate.
Claim 8
Dependent Claim
27 words
A composite plastic part as in claim 1 wherein one thermoplastic material is polycarbonate and the other thermoplastic material is at least one of polycarbonate and acrylonitrile-butadiene-styrene.
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) | 1992-04-17 | 1992-10-17 | 1993-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-04-17 | 1996-10-17 | 1997-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-04-17 | 2000-10-17 | 2001-04-18 | $7700.00 | Window Closed / Lapsed |