US4668450A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for the production of inscribed keys
Assignee: Siemens AG
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Filing: 1985-11-21
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Granted: 1987-05-26
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Expires: 2005-11-21
Abstract
Abstract The invention facilitates application of light colored inscriptions of arbitrary size on a dark colored key body, the key body consists of a dark colored base component and a light colored component which bears the inscription, which are produced by two-color injection. The light colored component which bears the inscription is then darkened by thermal diffusion, with the exception of the inscription.
Inventors
- 👤 Franz Bl/o/ chl
- 👤 J/u/ rgen Reuschel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 15:41
CPC Classifications
B; B29; B29C; B29C71/00; B29C71/02; B41; B41J; B41J5/00; B41J5/08; B41J5/12; B29C45/00; B29C70/00; B29C70/68; B29K; B29K2995/00; B29K2995/0018; B29K2995/002; B29K2995/0021; B29L; B29L2031/00; B29L2031/46; H; H01; H01H; H01H2229/00; H01H2229/044; H01H2229/046; H01H9/00; H01H9/18
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
57 words
A method for producing inscribed keys, comprising the following steps performed in order: producing a dark colored base component and a light colored inscription-bearing component by two-color injection molding; and subjecting all parts of the light-colored inscription-bearing component except the inscription to thermal diffusion, whereby the light colored inscription-bearing component is darkened, with the inscription remaining undarkened.
Claim 2
Independent Claim
57 words
A method for producing inscribed keys, comprising the following steps performed in order: producing a dark colored base component and a light colored inscription-bearing component by two-color injection molding; and subjecting all parts of the light-colored inscription-bearing component except the inscription to thermal diffusion, whereby the light colored inscription-bearing component is darkened, with the inscription remaining undarkened.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-05-25 | 1990-11-24 | 1991-05-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-05-25 | 1994-11-24 | 1995-05-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-05-25 | 1998-11-24 | 1999-05-26 | $7700.00 | Window Closed / Lapsed |