US3200182A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of a stress-free polycarbonate shaped article
Assignee: Bayer AG
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Filing: 1962-01-04
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Granted: 1965-08-10
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Expires: 1982-01-04
Abstract
No abstract record available.
Inventors
- 👤 Hechelbammer Wilhelm
- 👤 Streib Hugo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:21
CPC Classifications
C; C08; C08J; C08J7/00; C08J7/08; B; B29; B29C; B29C71/00; B29C71/02; B29C35/00; B29C35/02; B29C35/04; B29C35/041; B29C2035/042; B29C35/045; B29C2035/047; B29C2035/048; B29C2071/022; B29C2791/00; B29C2791/001; B29K; B29K2069/00; C08J2369/00
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
99 words
A METHOD FOR MAKING A SUBSTANTIALLY STRESS-FREE HIGH MOLECULAR WEIGHT THERMOPLASTIC POLYCARBONATE SHAPED ARTICLE WHICH COMPRISES SHAPING THE POLYCARBONATE WHICH IS AT A TEMPERATURE OF AT LEAST ABOUT 220*C. IN AN ATMOSPHERE HAVING A TEMPERATURE OF FROM ABOUT 70*C. TO ABOUT 120*C., MAINTAINING THE SHAPED ARTICLE AT A TEMPERATURE OF FROM ABOUT 70*C. TO ABOUT 120*C. UNTIL THE POLYCARBONATE HAS SUBSTANTIALLY COMPLETELY SOLIDIFIED AND THEREAFTER BRINGING THE COMPLETELY SOLIDIFIED SHAPED ARTICLE INTO SURROUNDINGS HAVING A TEMPERATURE OF FROM ABOUT 300*C. TO ABOUT 1200*C. FOR ABOUT 1 TO ABOUT 60 SECONDS SO THAT SUBSTANTIALLY NO MELTING OF THE POLYCARBONATE OCCURS.
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) | 1968-08-09 | 1969-02-08 | 1969-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-08-09 | 1973-02-08 | 1973-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-08-09 | 1977-02-08 | 1977-08-10 | $7700.00 | Window Closed / Lapsed |