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Patent US4594204A successfully refreshed from Google Patents.
US4594204A
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Process for annealing thermoplastically-shaped plastics parts
Assignee: Bayer AG
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Filing: 1984-09-24
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Granted: 1986-06-10
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Expires: 2004-09-24
Abstract
Abstract The present invention reduces within a short period of time the internal stresses in plastics bottles by annealing with infra-red radiation, in particular by specifically exposing critical points to radiation.
Inventors
- 👤 Klaus Heidenreich
- 👤 Hans-Werner Depcik
- 👤 Hans Radojewski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:34
CPC Classifications
B; B29; B29C; B29C71/00; B29C71/02; B29C71/04; B29C35/00; B29C35/02; B29C35/08; B29C35/0805; B29C2035/0822; B29K; B29K2069/00; B29L; B29L2031/00; B29L2031/712; B29L2031/7158
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
60 words
A process for annealing thermoplastically-shaped plastics parts for reducing the internal stresses, by treating the plastics parts after shaping with heat wherein the heat is transmitted to the plastics parts for 20-240 seconds by infra-red radiation of from 1200 nm to 5000 nm to produce a temperature of from 10 to 20% below the Vicat-softening temperature of the plastics parts.
Claim 2
Dependent Claim
60 words
A process for annealing thermoplastically-shaped plastics parts for reducing the internal stresses, by treating the plastics parts after shaping with heat wherein the heat is transmitted to the plastics parts for 20-240 seconds by infra-red radiation of from 1200 nm to 5000 nm to produce a temperature of from 10 to 20% below the Vicat-softening temperature of the plastics parts.
Claim 3
Dependent Claim
22 words
An annealing process according to claim 1 wherein the plastic parts are exposed to the infra-red radiation for 30 to 120 seconds.
Claim 4
Dependent Claim
17 words
An annealing process according to claim 1 wherein the shaped plastics parts are hollow bodies of polycarbonate.
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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) | 1989-06-09 | 1989-12-09 | 1990-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-06-09 | 1993-12-09 | 1994-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-06-09 | 1997-12-09 | 1998-06-10 | $7700.00 | Window Closed / Lapsed |